Terence Tyler, NJ supermarket shooter, tweeted about wanting to kill people

Cristina LoBrutto and Bryan Breen are seen in these undated Facebook pictures.
Cristina LoBrutto and Bryan Breen are seen in these undated Facebook pictures.
Cristina LoBrutto and Bryan Breen, seen in undated Facebook pictures, were killed at a Pathmark in New Jersey Friday morning

(CBS/AP) NEW BRUNSWICK, N.J. - The ex-Marine who shot and killed two co-workers and himself at a New Jersey supermarket Friday had posted remarks about killing on social media more than two years before the rampage.

Terence Tyler's Twitter account, which had a photograph identified by family members as Tyler, interspersed posts about hating Marine life, expressions of violence, and his take on football, movies, women and other interests.

"smh is it normal to want to kill ALL of ur coworkers? Maybe but I'm actually in a position where I can, smh," he wrote in June 2009, using the handle (at)Tylerbkstyle and the abbreviation "smh" for "shaking my head."

Months later, Tyler tweeted again about killing.

"I'm starting to see why plp go on killin sprees," he wrote. And these (obscenity) are reeeeeeally pushin my kill everyone I see button."

At the top of Tyler's Facebook page was the motto: "Be optimistic. All the people you hate are going to eventually die."

An autopsy shows that two New Jersey supermarket employees killed during a rampage by a co-worker this week died from single gunshot wounds.

Middlesex County Prosecutor Bruce Kaplan says autopsies were performed Saturday on 18-year-old Cristina LoBrutto and 24-year-old Bryan Breen. They were gunned down early Friday at a Pathmark store in Old Bridge Township by 23-year-old Tyler, who committed suicide by shooting himself once in the head with a handgun.

All three were pronounced dead at the scene. About a dozen other workers who were in the store were able to escape the shooting and were not hurt.

The supermarket has been shuttered since the shootings occurred, and a Pathmark spokeswoman said Sunday that it was not known when the store might reopen.

It's still not clear what sparked the shootings. Authorities are investigating a motive, but family members said Tyler - who once tweeted about killing "everyone I see" - was discharged from the Marines two years ago after suffering from depression and had never gotten over his mother's death about five years ago.

Authorities said Tyler left his job as an overnight clerk at the supermarket around 3:30 a.m. He drove off and returned to the store shortly afterward with a handgun and an assault rifle similar to an AK-47.

Tyler, who was dressed in camouflage gear, fired more than 16 rounds from his rifle - shooting first at an employee standing outside the closed store and blowing out windows, authorities said. He then went inside and shot at five other workers in an aisle, including LoBrutto and Breen.

Authorities say Tyler had worked at the store for less than two weeks.

More on CrimesiderAugust 31, 2012 - New Jersey supermarket gunman identified as 23-year-old employee Terence Tyler, prosecutors sayAugust 31, 2012 - New Jersey Supermarket Shooting: Early morning attack leaves 3 dead, including gunman, police say