Eddie Ray Routh, suspect in murder of ex-Navy SEAL Chris Kyle, on suicide watch

A Texas sheriff says the man charged with killing a former Navy SEAL and his friend was shocked with a stun gun and restrained in his jail cell after becoming aggressive.

Erath County Sheriff Tommy Bryant says 25-year-old Eddie Ray Routh is on suicide watch.

Bryant says Routh also appeared ready to assault jailers Sunday night when they entered Routh's solitary confinement cell because he refused to return his food tray. Bryant says after using the stun gun once, jailers put Routh in a chair that restrains his arms and legs.

Routh is charged with fatally shooting Chris Kyle, author of the best-selling book "American Sniper," and his friend Chad Littlefield at a shooting range Saturday.

The sheriff says Routh has an attorney but hasn't met with him.

Kyle, 38, had left the Navy in 2009 after four tours of duty in Iraq, where he earned a reputation as one of the military's most lethal snipers.

Kyle was so deadly accurate in combat that insurgents in Iraq put a $20,000 bounty on his head and dubbed him "The Devil of Ramadi." But to fellow SEALs like Rorke Denver, he was known as "The Legend." Denver told CBS News, "We were aware early on in that deployment that something special, for lack of a better term, was unfolding."

After leaving the Navy, Kyle quickly found a way to maintain contact with his fellow veterans and pass on what had helped him work through his own struggles. By late 2011, he filed the paperwork to establish the nonprofit FITCO Cares, which received its nonprofit status the following spring, said FITCO director Travis Cox.

"Chris struggled with some things," Cox said. "He'd been through a lot and he handled it with grace, but yeah he did struggle with some things. And he found a healthy outlet and was proactive in his approach to deal with those issues and wanted to help spread his healing, what worked for him, to others. And that's what he died doing."

For Kyle that healthy outlet was exercise. At the heart of FITCO was giving in-home fitness equipment to physically and emotionally wounded veterans, as well as families who had lost a veteran, Cox said.

Littlefield, a 35-year-old friend and neighbor, was Kyle's "workout buddy," and also volunteered his time to work with veterans, Cox said. He was married and had children as well.

"He's a very gentle, sweet-hearted man, just a great man, kind of quiet," Cox said of Littlefield. "He just really cared. ... He wanted to do whatever he could to help veterans and help see that vision of serving others that Chris had. He shared that vision with all of us. He was a great man."

Cox said he understood that Kyle and Littlefield were helping Routh work through his own PTSD, but that he did not know how they came into contact. He said it was not a FITCO session.

Erath County Sheriff Tommy Bryant on Sunday offered a similar description of the situation.

"It's my understanding that the suspect may have been suffering from some type of mental illness from being in the military himself," he said of Routh.

He said Routh's mother may have reached out to Kyle for help with her son.

"We kind of have an idea that maybe that's why they were at the range for some type of therapy that Mr. Kyle assists people with," Bryant said.

Bryant didn't know whether Routh was on any medication or whether he had been diagnosed with post-traumatic stress disorder.

Authorities say the three men arrived at the Rough Creek Lodge southwest of Fort Worth around 3:15 p.m. Saturday. A hunting guide discovered the bodies of Kyle and Littlefield around 5 p.m. and called 911.

Routh allegedly left in Kyle's pickup and went to his sister's in Midlothian. He told what he had done and left. She called police and Routh was eventually found at his home in Lancaster. After a short pursuit he was arrested.

Routh was being held on $3 million bail in the Erath County Jail. Authorities said they believed he had requested a court-appointed attorney. Calls to his home were not answered Sunday.

Kyle was also president of a security training firm Craft International. Craft had scheduled a $2,950-per-person civilian training event at Rough Creek Lodge called the "Rough Creek Shoot Out!" for March 1-3. The price included lodging, meals and shooting instruction. Kyle was scheduled to teach the first class, called "precision rifle."

But the work with veterans through FITCO was Kyle's passion, Cox said.

FITCO Cares offered life coaching for veterans, a daily support group and weekly group counseling. Sometimes veterans in other states would video conference in to counseling sessions, Cox said.

Kyle was always recognized at events, but would deflect attention to other veterans, quickly introducing and praising those around him.

"That camaraderie is usually missed once the veteran gets out of the military," said Cox, himself a former Marine sniper. "The authentic relationships that you develop in the military, especially overseas and in combat are some of the most meaningful, authentic relationships that one can have and it's missed. And so we tried to create a means through this group of veterans that can gather and talk about things that they're dealing with."

"He (Kyle) didn't have any fear at all as far as working with an extreme case," Cox said. "Just like in combat he would take it on head on and do whatever he could to give these guys assistance. There was no fear in helping anyone that may have an extreme case. He was willing to help anyone in need."