© 2026 ABC News

Lannon was previously married to one of the four victims, Jennifer Lannon, 39, Albuquerque police confirmed to ABC News. Both were from New Jersey and had been living in Grants, about 80 miles west of Albuquerque, police said.

Court records show Sean Lannon filed for divorce in 2018 in Grants District Court, seeking custody of their three children.

Lannon had flown to New Jersey with the children in tow, and authorities \"assured the safety of those three early on,\" Gilbert told ABC News.

The other three victims were identified as Jesten Mata, 40; Matthew Miller, 21; and Randal Apostalon, 60.

Both Jennifer Lannon and Mata were previously wanted by the Grants Police Department for questioning last month in the disappearance of Miller, before they were also reported missing.

The Albuquerque Police Department is sending detectives to St. Louis as part of the investigation, Chief Harold Medina said.

ABC News' Leonardo Mayorga contributed to this report.

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