Matthew Warren died of self-inflicted gunshot

Authorities say autopsy results show that the son of popular megachurch pastor Rick Warren died of a self-inflicted gunshot wound.

Sheriff's spokesman Jim Amormino said Monday that 27-year-old Matthew Warren died on Friday.

Amormino says the ruling was also based on evidence found at the scene.

To whom the weapon belonged to is still unclear. The Warrens said in an email on Saturday that their son struggled with deep depression and suicidal thoughts.

This high-profile suicide could reignite debate over gun control and suicides. The US military, in particular, has been grappling with the issue lately. As The Christian Science Monitor reported, "nearly half of all soldiers who commit suicide use a firearm, Gen. Peter Chiarelli points out. He added that “suicide in most cases is a spontaneous event” that is often fueled by drugs and alcohol. But “if you can separate the individual from the weapon,” he added, “you can lower the incidences of suicide.”

Warren posted a message on Twitter Sunday saying he was "overwhelmed" by the love and support offered after the apparent suicide of the youngest of his three children.

"Kay and I are overwhelmed by your love, prayers, and kind words," Warren tweeted to his nearly one million followers two days after Matthew Warren, 27, was found dead. "You are all encouraging our (hash)brokenhearts." The pastor posted the same message on his Facebook page.

Warren did not attend Sunday services at his Saddleback Church in Orange County, where worshippers opened the meeting with a prayer for the family.

Tom Holladay, teaching pastor at Saddleback and Matthew Warren's uncle, opened the 9 a.m. worship service by saying the congregation would face the tragedy together, "as a church family."

Holladay led a prayer for Warren and his wife, Kay, and their surviving son and daughter.

The Warrens said in an email to church staff Saturday that Matthew Warren had taken his own life in a "momentary wave of despair." It said he had long struggled to control his emotional pain despite years of prayers and the best available treatment.

"Matthew was an incredibly kind, gentle and compassionate young man whose sweet spirit was encouragement and comfort to many," the email said. "Unfortunately, he also suffered from mental illness resulting in deep depression and suicidal thoughts."

The elder Warren founded Saddleback Church in 1980, according to his biography on the church website, and watched it grow to 20,000 members and several campuses beyond its home base of Lake Forest.

Already well-known among evangelical Christians, he became a national celebrity in 2002 with the publication of the multimillion-selling book "The Purpose Driven Life," whose popularity reached far beyond the usual religious readers.

He later delivered the opening prayer at Barack Obama's inauguration in 2008.

Copyright 2013 The Associated Press.+