COLORADO SPRINGS, COLO. ? The gunman believed to have killed four people at a megachurch and a missionary training school had been thrown out of the school a few years ago and had been sending it hate mail, police said in court papers Monday.

The gunman was identified as Matthew Murray, 24, who was home-schooled in what a friend said was a deeply religious Christian household. Murray’s father is a neurologist and a leading multiple-sclerosis researcher.

Five people – including Murray – were killed and five others wounded Sunday in the two eruptions of violence 12 hours and 65 miles apart.

The first attack took place at Youth With a Mission, a training center for missionaries in the Denver suburb of Arvada; the other occurred at the New Life Church in Colorado Springs, where Murray was shot by a security guard, though investigators said he may have died from a self-inflicted gunshot wound.

“Through both investigations it has been determined that most likely the suspect in both shootings are one in the same,” police said in court papers.

Colorado Springs police said the “common denominator in both locations” was Youth With a Mission.

The training center maintains an office at the 10,000-member church.

“It appears that the suspect had been kicked out of the program three years prior and during the past few weeks had sent different forms of hate mail to the program and-or its director,” police said.

In a statement, the training center said health problems kept Murray from finishing the program. It did not elaborate. Murray did not complete the lecture phase or a field assignment as part of a 12-week program, Youth With a Mission said.

“The program directors felt that issues with his health made it inappropriate for him to” finish, it said.

Police gave no immediate details on the hate mail. And the training center said that Murray left in 2002 – five years ago, not three – and that no one there can recall any visits or other communication from him since then.

Earlier Monday, a law enforcement official who spoke on condition of anonymity said it appeared Murray “hated Christians.”

Investigators have not said whether Murray singled out his victims.

But the two people killed at the church – sisters Stephanie and Rachael Works, ages 18 and 16 – frequented the training center, their uncle Mark Schaepe of Lincoln, Neb., told The Gazette of Colorado Springs.

Authorities searched the Murray house on a quiet street in Englewood on Monday for guns, ammunition and computers.

No one was home when a reporter visited the split-level brick home early Monday. Murray’s father, Ronald S. Murray, is chief executive of the Rocky Mountain Multiple Sclerosis Center in Englewood.

Matthew Murray lived there along with a brother, Christopher, 21, a student at Oral Roberts University in Tulsa, Okla.

Jeanne Assam, a church member who volunteers as a security guard, shot Murray, who was found with a rifle and two handguns, police said.

Assam said she believes God gave her the strength to confront Murray, keeping her calm and focused.

“It seemed like it was me, the gunman and God,” she said at a news conference.