Police investigating

motive for shooting

in St. Louis that left

4 dead

January 8, 2010 6:46 p.m. EST

Timothy G. Hendron arrived at work Thursday with three weapons and hundreds of rounds of ammo.

St. Louis, Missouri (CNN) -- Timothy G. Hendron's co-workers were

expecting him at their Missouri workplace Thursday. He arrived wearing

typical office attire: Dockers and a button-down, collared shirt.But,

police said Friday, Hendron also donned a fanny pack filled with

magazines for the guns he allegedly used to pop off more than

100 rounds, killing three and wounding five others.Hendron arrived

at work armed with hundreds of bullets and an assault rifle, two

handguns and a shotgun, St. Louis Police Capt. Michael Sack said

at a news conference Friday.He opened fire at about 6:30 a.m. (7:30 a.m. ET)

Thursday at ABB Inc., a St. Louis transformer manufacturing company,

police said.When they entered the facility, Sack said, police found

"a gruesome scene" -- the dead and wounded and those employees

desperately hiding from the shooter.The 51-year-old suspect was found

inside an ABB Inc. office dead from a self-inflicted gunshot wound, police

said. Carlton J. Carter, 57; Terry Mabry, 55; and Cory Wilson, 27,

were dead from gunshot wounds to the head. Mabry also was shot

in a leg and Wilson was also shot in a shoulder, according to authorities.

Police were investigating whether the shooter targeted the victims,

Sack said.Police are also looking into the motive for the shooting,

but Sack said it could remain a mystery.Video: Deadly shooting at

a factoryVideo: Workers killed in attackRELATED TOPICSShootings

Civil TrialsMissouri"I would imagine that you could say yes [it was p

remeditated], because most people don't come to work armed in

such a manner, but that's just speculation," Sack said. "We have

to go back and try and figure out what motivated him and like I said,

we may never truly know what motivated him to do this."Sack said

police are looking into Hendron's work history and his personal

relationships.Hendron was one of a group of ABB employees listed

in a lawsuit filed in 2006 against administrators of the company's

retirement plan. Police said they were working closely with ABB

executives to get more information about the suspect and his status

with the company prior to the incident.ABB spokesman Bob Fesmire

said Thursday there are about 100 employees who work at the facility,

but some of them were unable to come in Thursday because of

heavy snow. Police estimated 40 to 50 employees were in the building

at the time of the incident.The federal suit filed by Hendron and others

accuses pension plan administrators of, among other things, causing

the plan to include "unreasonable and excessive" fees and expenses,

paid by participants, without their knowledge and not used for their

benefit or that of the plan.Linda Siegfried, a spokeswoman for the law

firm representing the plaintiffs, told CNN on Thursday that Hendron was

among the plaintiffs, although his name is spelled three different ways

in court documents. A trial on the matter is currently being held in

Kansas City, Missouri, Siegfried said. She didn't know whether Hendron

would have been required to be present. Online federal court records

show the trial began January 5.Siegfried would not comment further

except to say the firm offers its concern for the welfare of the victims.

FOLLOW THIS TOPICSTORY HIGHLIGHTS:

Timothy G. Hendron killed three men and himself at a

St. Louis, Missouri, workplace Thursday.

He was one of the plaintiffs in a lawsuit filed against

company retirement plan administratorsPlaintiffs' attorney:

It's unclear if Hendron was to be present at a trial in lawsuit in

Kansas CityPolice captain said a motive in the killings at

ABB Inc. could remain a mystery.