A Dallas man was believed to kill and hold his three co-workers captive inside a closed northeast Pennsylvania grocery store overnight Thursday involuntarily guided police as he left traces behind him when he posted a video on his Twitter account, praising the shooters of Columbine High School of 1999.

Wyoming County District Attorney Jeff Mitchell said that that suspect Randy Stair, 24, posted a 42-minute video footage about a brutal attack at the time of the killings.

The Video

The video footage features Stair praising Columbine shooters Eric Harris and Dylan Klebold as heroes and he was kissing a loaded weapon.

Police say Stair got two pistol-grip shotguns in order to work at the store in rural Tunkhannock, about 150 miles north-west of New York City (241 kilometres). Stir closed store exits and started shooting around 1 a.m. A fourth co-worker roughly escaped the massacre and called the police.

It was reported that Stair killed himself.

“This is really a mental health situation that utterly spiralled out of control,” Mitchell said. “I think he had longstanding mental health issues that resulted in this horrible tragedy.”

He killed Terry Sterling, 63, of South Montrose; Victoria Brong, 26, of Factoryville; and Brian Hayes, 47, of Springville.

“It’s just unspeakable, it really is,” Mitchell said. “These people went to work and they lost their lives because they went to work. It’s senseless.”

Stair reportedly hated his night manager. However, it is unclear which of the victims held the position.

Comments

“Ironically, the night manager apparently liked him.” Mitchell said.

Mitchell said Stair shot up the supermarket, destroyed it alongside the goods with a toll of 59 rounds.

The fourth co-worker managed to escape the massacre after the other three victims were fatally shot. It was also reported that Stair had apparently seen her while attempting to escape.

“For whatever reason, he did not shoot at her and she was able to escape.” Mitchell said.

Regardless the unusual video footage, Stair raised controversy on his Twitter bio that he wants to die.

On his Twitter home page, Stair wrote under pseudonym Andrew Blaze: “I had to die in order to truly live. Speaking from before and beyond the grave.”