Stephenville , Texas ( CNN ) Incoherent . Talking nonsense . Erratic . Not the man they knew . That 's how family members and friends have described Eddie Ray Routh , the man on trial for the slayings of Chris Kyle , subject of the hit film `` American Sniper , '' and Kyle 's friend , Chad Littlefield , at a Texas firing range two years ago . No one disputes that Routh shot and killed the two men . But defense attorneys say Routh was insane . On Wednesday , the suspect 's sister , brother-in-law and former girlfriend testified about Routh 's behavior before and after the killings . `` I asked him if he was seeing things , and he said yes , '' Jennifer Weed , his ex , told the court , describing a conversation that happened the night before the slayings . `` And then I asked him if he was hearing things , and he said yes . '' Weed testified that Routh got out a yellow legal pad and started writing . `` And when I tried to speak to him he would take his hand and cover my mouth because he didn¹t want them to hear what I had to say , '' she said . Routh 's demeanor after the killings was equally strange . `` He said he had to take two souls before they could take his . And I asked him what he meant by that , and he said they were out to get him , '' Laura Blevins , his sister , told the court . `` He was talking nonsense . '' She said she told him : `` I love you , but I hate your demons . '' `` The man who was my brother was not at my house . The person who came to my house is not the man who I knew was my brother , '' Blevins testified . Her husband said that Routh `` babbled about other incoherent things . '' `` I had a sick feeling on what it meant , '' Gaines Blevins told the court . Prosecutors have described Routh as a troubled young man , but they argue he was n't insane ; they say these are the actions of a cold-blooded killer . On Tuesday , prosecutors showed a video of police placing Routh into a squad car moments after authorities chased him down a Texas highway . In the video , Routh is breathing heavily and teary-eyed . An officer asks if he 's OK. Routh replies : `` I 'm just so nervous about what 's been happening in my life today . I do n't know what 's been happening . I 've been so paranoid schizophrenic all day . I do n't know what to even think of the world right now . I do n't know if I 'm insane or sane . '' The small arsenal of weapons Kyle brought to the range that day was shown to the jury , which included five long rifles and several handguns , including one of Kyle 's rifles labeled `` American Sniper . '' According to defense attorneys , Routh , in his psychotic state , thought he was walking into a showdown on the range . Taking the stand for the defense , mother Jodi Routh described her son 's history of mental health problems . After his time serving in the military , she said , `` he was no longer his happy-go-lucky self . '' His first stay in a VA mental ward was for three days in 2011 , she said . Then he returned again , against his will , and spent weeks in the facility . When he was released , she said , he was on nine medications , including mood elevators , anti-psychotic medications and sleep aids . Jodi Routh said she had asked Kyle to help , telling him that her son had been diagnosed with post-traumatic stress disorder . She told Kyle that her son had been hospitalized multiple times , but did not tell him that he 'd also threatened to kill himself and his family . `` Do you regret not sharing that level of detail ? '' prosecutor Jane Starnes asked . `` I just wanted to get help for my son , '' the mother replied . Routh 's trial comes just weeks after the release of the film about Kyle , a former Navy SEAL who claimed to be the deadliest sniper in U.S. history , with 160 confirmed kills in Iraq . `` American Sniper , '' directed by Clint Eastwood and starring Bradley Cooper , has grossed the most ever for a war movie . Kyle 's autobiography by the same name spent weeks on best-seller lists . He had already risen to fame through his book when he died and was involved in charitable work to help former troops suffering from post-traumatic stress disorder . Kyle and Littlefield took Routh to the firing range as a kind of therapy . The range is a small , remote part of the sprawling 11,000-acre Rough Creek Lodge , and the men were isolated . A hunting guide found Kyle , 38 , and Littlefield , 35 , Kyle 's friend , motionless and called 911 . The men were dead when officers arrived . Correction : Earlier versions of this report incorrectly described the military background of Chad Littlefield , who was killed with Chris Kyle . Littlefield was not a veteran . CNN 's Catherine E. Shoichet and Dana Ford contributed to this report .
Eddie Ray Routh 's sister says he she told him : `` I love you , but I hate your demons '' He is on trial for the 2013 shooting deaths of Chris Kyle and Chad Littlefield . Routh 's mother said he had PTSD ; the prosecution argued he was not insane .