LAKE BUTLER, Fla. -

Union County investigators said they found a handwritten note inside the home of a former trucking company employee who went on a weekend shooting rampage that left him and two others dead.

Deputies said the note inside 72-year-old Hubert Allen Jr.'s house had the names of the individuals targeted on them.

While investigators said that shows some premeditation, they still have not identified a clear motive for the shootings.

They said there was one other person named in the letter who was not killed, but they were withholding his identity.

Union County sheriff's Lt. Lyn Williams said three days of interviews with people who knew Allen haven't turned up a motive for Saturday's shooting spree centered around Pritchett Trucking Inc.

Allen retired from Pritchett Trucking nine days before the shooting rampage.

The Rev. Patrick Maxwell of Victory Christian Center said even family members do not know why he went on the shooting spree. Allen's daughter and grandchildren are members of Maxwell's church and went to their home on the day of the shootings to comfort and counsel them.

"We all hope and pray that some answers come out, but unfortunately the only person that knows is no longer with us. He slipped into eternity," Maxwell said.

On Saturday, Allen drove to a location owned by his former boss, Marvin Prichett (pictured above), the trucking company's founder. He shot and killed former co-worker Rolando Gonzalez-Delgado (pictured below on left), 28, around 9 a.m., then went a short distance and killed Prichett, 80, who began the company in 1980. Allen, at one time, was considered his top assistant.

Pritchett also owned the house the Allen family was living in. They were renting it from him.

A few minutes later, Allen pulled over where another former co-worker was driving a farm tractor, exchanged words with him and fired a shotgun, authorities said. The victim, 66-year-old Lewis Mabrey Jr., was in good condition.

Allen then went to the company's headquarters in Lake Butler and shot 44-year-old David Griffis (pictured above on right) in the stomach, the sheriff's office said. Griffis was in critical condition.

Allen killed himself at his nearby home. Allen was the great-grandfather of Buffalo Bills running back C.J. Spiller.

Police recovered three guns in the shootings -- a .22 caliber rifle, a small bore shotgun and an unfired .32 caliber handgun from Allen's home.

Sheriff Jerry Whitehead said the suicide note investigators found at Allen's house wasn't addressed to anyone in particular, but the note was written on at least three separate occasions.

"It was very shocking that he was involved in it. He was just your hometown boy," Lake Butler Mayor Lonnie Norman said.

Norman said he knew Allen well and never expected he'd be capable of murder and suicide.

"It's a shock," he said. "We don't deal with stuff like this on a regular basis like the bigger cities, so it's like family. You're affected."

Prichett Trucking's website said it employs 400 people and owns hundreds of vehicles that operate nationwide.

Meanwhile, residents of the close-knit community participated in a blood drive Monday for Griffis. A website has also been set up to raise funds for Griffis' medical expenses.

"My daughter needed blood one time and he gave her blood, so I decided to give him blood and pay back the community mine," Eddie Smith said.

Those who would like to donate to the fund can click here.