After Jack Wagner shared with fans on Sunday that his youngest son with ex-wife Kristina Wagner, Harrison, had gone missing, the Bold and the Beautiful star tweeted on Monday that he had finally been in contact with him.
"Harrison's been in touch, he's 21 and in charge of his life," the 56-year-old actor wrote. "[Thank you] for the [love] and prayers, please continue to share your struggles, it helps us all."
On Sunday, Jack revealed that Harrison had been missing for nearly a week. "I'm going to ask those who want to share their fears, addictions and struggles to do so with me via Twitter. We can face them together, I'll start," he wrote. "I fear for my youngest sons safety. Harrison has struggled with drugs and alcohol just as I did when I was younger. He's relapsed and is MIA five days."
See photos of Jack Wagner throughout his career:
Jack Wagner, 1985. (Photo by Michael Ochs Archives/Getty Images)
1985 AMERICAN MUSIC AWARDS - Show Coverage - Airdate: January 28, 1985. (Photo by ABC Photo Archives/ABC via Getty Images)
PRESENTERS REBBIE JACKSON AND JACK WAGNER
Jack Wagner at the ABC Television Affiliates Party, NY Hilton Hotel, New York City. (Photo by Ron Galella/WireImage)
Jack Wagner at the Jack Wagner at Bar One, Bar One, Beverly Hills. (Photo by Ron Galella/WireImage)
Jack Wagner at the 6th Annual T.J. Martell-Reebox Celebrity Golf Invitational, Calabasas Country Club, Calabasas. (Photo by Ron Galella/WireImage)
Jack Wagner at the Boathouse Rock 4 Benefit amfAR's Youth Executive Support Group, Central Park Boathouse, New York City. (Photo by Ron Galella/WireImage)
Jack Wagner and Kristina Wagner at the 3rd Annual Vanity Fair Oscar Party, Morton's Restaurant, West Hollywood. (Photo by Ron Galella/WireImage)
THE TONIGHT SHOW WITH JAY LENO -- Episode 902 -- Pictured: (l-r) Actor Jack Wagner during an interview with host Jay Leno on April 16, 1996 -- (Photo by: Margaret C. Norton/NBC/NBCU Photo Bank via Getty Images)
Jack Wagner at the Jack Wagner at Los Angeles International Airport, Los Angeles International Airport, Los Angeles. (Photo by Ron Galella/WireImage)
Jack Wagner and Kristina Wagner at the 6th Annual Boathouse Rock to Benefit amfAR, Central Park, New York City. (Photo by Ron Galella/WireImage)
Kristina Wagner and Jack WagnerJack Wagner at the Final Wrap Party for 'Melrose Place', The Century Club, Century City. (Photo by Ron Galella/WireImage)
1/30/00 New York, NY. Richie Sambora, Heather Locklear and Jack Wagner celebrate Super Bowl Sunday and the opening of the musical, 'Jekyll & Hyde' at Coppola's East in New York. Wagner just assumed the title role. Photo by Robin Platzer/Twin Images/Online USA, Inc.
385243 01: FILE PHOTO: Actor Jack Wagner, of television's 'Melrose Place,' stands on the green during a celebrity golf tournament at Paradise Island in Nassau, the Bahamas. It was reported February 5, 2001 that Wagner and his longtime wife Kristina Wagner, who stars in television's 'General Hospital,' have filed for divorce. (Photo by Tim Chapman/Liaison)
Jack Wagner at the Riviera Country Club in Pacific Palisades, California (Photo by Jean-Paul Aussenard/WireImage)
Jack Wagner during A Diamond is Forever Pre-Oscar Party with Camp Freddy Performance - Arrivals at SOHO House in Los Angeles, California, United States. (Photo by Jeffrey Mayer/WireImage)
NEW YORK - MAY 21: Actor Jack Wagner poses backstage at the 31st Annual Daytime Emmy Awards on May 21, 2004 at Radio City Music Hall, in New York City. (Photo by Peter Kramer/Getty Images)
BEVERLY HILLS- CA, MARCH 4: Actor Jack Wagner arrives at The Alzheimer's Association's 12th Annual 'A Night at Sardi's' Grease themed celebrity fundraiser at the Beverly Hilton Hotel on March 4, 2004 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images)
LOS ANGELES, CA - JUNE 14: Jack Wagner stars as Dominick Payne in the CBS daytime drama The Bold and The Beautiful. Image dated June 14th, 2004. (Photo by Monty Brinton/CBS Photo Archive via Getty Images)
MONTE CARLO, MONACO - JULY 2: U.S Actor Jack Wagner poses during a photocall at the 44th Monte-Carlo Television Festival on July 2, 2004 in Monte Carlo, Monaco.The Celebration of Global Television runs from June 28 - July 3 and will feature television stars from around the world. (Photo by Pascal Le Segretain/Getty Images)
Jack Wagner and guest during 44th Monte Carlo Television Festival - Closing Ceremony - Arrivals at Grimaldi Forum in Monte Carlo, Monaco. (Photo by Christian Alminana/FilmMagic)
LOS ANGELES - FEBRUARY 13: Actor Jack Wagner and son Harrison attend the premiere of the New Line Cinema comedy 'Son of the Mask' on February 13, 2005 at the Grove Theatres in Los Angeles, California. (Photo by Vince Bucci/Getty Images)
Jack Wagner during 'The Upside of Anger' Los Angeles Premiere - Arrivals at The National in Westwood, California, United States. (Photo by Jeffrey Mayer/WireImage)
NEW YORK - MAY 20: Actor Jack Wagner and an unidentified guest arrive at the 32nd Annual Daytime Emmy Awards at Radio City Music Hall May 20, 2005 in New York City. (Photo by Peter Kramer/Getty Images)
Jack Wagner during 2005 International Emmy Awards Gala - Red Carpet and Pressroom at New York Hilton in New York City, New York, United States. (Photo by Stephen Lovekin/WireImage)
Jack Wagner during 4th Annual Golden Boomerang Awards - Arrivals at Four Seasons Hotel in Beverly Hills, California, United States. (Photo by Michael Tran/FilmMagic)
Jack Wagner during 2005 International Emmy Awards Gala - Press Room at New York Hilton in New York City, New York, United States. (Photo by Robin Platzer/FilmMagic)
Thomas Calabro, Daphne Zuniga, Marcia Cross, Kristin Davis,Laura Leighton, Heather Locklear, Patrick Muldoon, Doug Savant, Andrew Shue and Jack Wagner Cast of Melrose Place (Photo by Jeff Kravitz/FilmMagic, Inc)
Kristina Wagner and Jack Wagner during 1995 Melrose Party Celebrating 100th Episode in Los Angeles, CA, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
Jack Wagner with Amanda Pace and Rachel Pace during 'The Bold and the Beautiful' Gala to Celebrate 20 Years at Two Rodeo in Beverly Hills, California, United States. (Photo by M. Tran/FilmMagic)
LOS ANGELES, CA - JUNE 20: Heather Tom and Jack Wagner attends the pressroom at the 35th Annual Daytime Emmy Awards on June 20, 2008 in Los Angeles, California. (Photo by Jeffrey Mayer/WireImage)
LOS ANGELES, CA - FEBRUARY 16: Jack Wagner (R) and his son attend a game between the Golden State Warriors and the Los Angeles Lakers at Staples Center on February 16, 2010 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images)
LOS ANGELES, CA - DECEMBER 31: Jack Wagner and Heather Locklear attend a game between the Philadelphia 76ers and the Los Angeles Lakers at Staples Center on December 31, 2010 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images)
LOS ANGELES, CA - FEBRUARY 7: Jack Wagner attends the 6,000 Episode of 'The Bold and the Beautiful' at CBS Television City on February 7, 2011 in Los Angeles, California. (Photo by Gregg DeGuire/FilmMagic)
LOS ANGELES, CA - MARCH 31: Heather Locklear (L) and Jack Wagner attend a game betweenthe Dallas Mavericks and the Los Angeles Lakers at Staples Center on March 31, 2011 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images)
UNIVERSAL CITY, CA - NOVEMBER 22: Actor Jack Wagner performs at the Hollywood Christmas Parade 2011 Concert at Universal CityWalk on November 22, 2011 in Universal City, California. (Photo by Chelsea Lauren/WireImage)
BEVERLY HILLS, CA - MAY 04: Singer Katherine Jenkiins and actor Jack Wagner arrives to BritWeek 2012's 'Evening with Piers Morgan' on May 4, 2012 in Beverly Hills, California. (Photo by Alberto E. Rodriguez/Getty Images)
TOLUCA LAKE, CA - MAY 07: Jack Wagner arrives at the 5th Annual George Lopez Celebrity Golf Classic to benefit The Lopez Foundation held at Lakeside Golf Club on May 7, 2012 in Toluca Lake, California. (Photo by Michael Tran/FilmMagic)
CASTLE - 'Significant Others' - When a powerful divorce attorney who only represented women is murdered, Castle and Beckett are confronted with a plethora of angry ex-husbands, any one of whom could be the murderer. Meanwhile, Castle's ex-wife (Darby Stanchfield, 'Scandal'), Meredith, moves into the loft to take care of Alexis while she recovers from Mono, and to make matters worse, Beckett is also forced to move in while her apartment is being fumigated, causing tension, humor and more than a little awkwardness, on 'Castle,' MONDAY, JANUARY 7 (10:01-11:00 p.m., ET) on ABC. Jack Wagner ('Melrose Place') guest stars as a pro golfer whose career went down in flames after a nasty divorce, and Nancy Lee Grahn ('General Hospital') guests as a wealthy divorcee caught in a 'War of the Roses'-like struggle with her ex-husband. (Photo by Carol Kaelson/ABC via Getty Images)
SAN MARINO, CA - JANUARY 11: Actor Jack Wagner arrives at the Hallmark Channel & Hallmark Movie Channel 2014 Winter TCA Party on January 11, 2014 at The Huntington Library and Gardens in San Marino, California. (Photo by Barry King/FilmMagic)
BEVERLY HILLS, CA - OCTOBER 11: Actor/singer Jack Wagner and guest arrive at the 2014 Carousel Of Hope Ball Presented By Mercedes-Benz at The Beverly Hilton Hotel on October 11, 2014 in Beverly Hills, California. (Photo by Gregg DeGuire/WireImage)
NEW YORK, NY - APRIL 09: Jack Wagner performs at B.B. King Blues Club & Grill on April 9, 2015 in New York City. (Photo by Bobby Bank/WireImage)
HOLLYWOOD, CA - MAY 14: Jack Wagner arrives at launch event for 'Put Your Money Where The Miracles Are' campaign held at Avalon on May 14, 2015 in Hollywood, California. (Photo by Michael Tran/FilmMagic)
BEVERLY HILLS, CA - JULY 29: (L-R) Actor Jack Wagner and wife Kristina Wagner attend the 2015 Summer TCA Tour - Hallmark Channel and Hallmark Movies And Mysteries on July 29, 2015 in Beverly Hills, California. (Photo by Barry King/Getty Images)
WEST LOS ANGELES, CA - MAY 21: Jack Wagner attends the 44th Annual Los Angeles Police-Celebrity Golf Tournament at Rancho Park Golf Course on May 21, 2016 in West Los Angeles, California. (Photo by Gabriel Olsen/Getty Images)
NEW YORK, NY - JUNE 22: (EXCLUSIVE COVERAGE) (L-R) Jenny McCarthy poses for photos with actors Jack Wagner and Josie Bissett during 'Dirty, Sexy, Funny with Jenny McCarthy' at the SiriusXM studios on June 22, 2016 in New York City. (Photo by Astrid Stawiarz/Getty Images)
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Upon sharing his concern about his son, he also responded to numerous fans sharing their stories of struggle.
Harrison's parents were married in 1993, but divorced 13 years later in June 2006. Jack and Kristina also have a 25-year-old son, Peter, and Jack has a daughter, Kerry, from a previous relationship. The former couple appear amicable, even costarring in Hallmark's When Calls the Heart in 2015.
ET has reached out to Jack's rep regarding his son.