Grants man pleads guilty to four slayings in grisly 2021 case

May 22—A Grants man has pleaded guilty to killing four people he left dismembered inside bins in the back of a pickup truck atop the Albuquerque International Sunport parking structure in 2021.

Sean Lannon, 50, agreed to plead guilty last week to second-degree murder in the deaths of his wife, Jennifer Lannon, 39; Matthew Miller, 21; Jesten Mata, 40; and Randall Apostolon, 60.

Lannon will serve 15 years in prison for each homicide, totaling 60 years in the New Mexico Corrections Department, according to the plea agreement filed in 2nd Judicial District Court.

In 2022, Lannon was sentenced to serve 35 years in a New Jersey prison for beating a man to death in that state days after fleeing New Mexico, leaving the bodies of his wife and the three others at the Sunport.

The plea agreement states that Lannon will return to New Jersey to serve that sentence and, afterward, will come back to New Mexico to serve the 60 years.

Lannon's attorney could not be reached Wednesday. Lannon is currently behind bars at the Metropolitan Detention Center.

The four bodies were discovered on March 5 after someone smelled a foul odor coming from the truck. By then, Lannon was in New Jersey.

After killing the man in New Jersey, Lannon was arrested when he was found sleeping in the man's stolen vehicle in Missouri, apparently on his way back to New Mexico.

Lannon would eventually tell police he killed and dismembered his wife and her two friends, Miller and Mata, in January at the family's home in Grants. He told police he killed his wife after he caught her cheating with Mata and lured Mata and Miller to the house days later, killing both men.

Lannon told police he killed Apostolon, whom he met in Albuquerque, after Apostolon refused to help him transport the bins with the three bodies inside. Lannon left all four bodies in Apostolon's truck on the top floor of the Sunport. Inside the truck was the hammer he used to kill Apostolon.