Prosecutors tried to establish Christopher Vaughn as emotionless and concerned about his clothing as they zeroed in on the moments after his family was shot to death in Wednesday's testimony at the murder trial.
Vaughn is accused of shooting his wife Kimberly and their three children to death on I-55 in 2007.
The man Vaughn flagged down for help, John Speer, took the witness stand Wednesday and described seeing a limping and bloody man who said "I believe my wife just shot me."
Paramedic Derek Ellenberger testified that Vaughn didn't show any concern for his family at the scene.
"He was adamant that I didn't mess up his boots in any way," Ellenberger said.
Another paramedic said Vaughn had a blank stare and said that he didn't know where his family was before he stopped answering questions.
Defense attorneys said Vaughn's unresponsiveness could have been due to blood loss from his own injuries, superficial gunshot wounds to his leg and wrist.
Vaughn's defense lawyers maintain that Kimberly Vaughn was the one who committed the killings.