KAMLOOPS, B.C. - Evidence found in the home where three B.C. children were murdered suggested that their father may have tried to kill himself before leaving the trailer where their bodies were eventually found by their mother, a B.C. judge heard Friday.

RCMP forensic investigator Const. Jennifer Clark testified at the murder trial of Allan Schoenborn that crime scene photos show a bloody extension cord leading to a bathtub and a bent razor blade in the blood-spattered bathroom.

The defence and Crown submitted a list of agreed facts to B.C. Supreme Court Justice Robert Powers, which included that most of the blood evidence found in the home was from Schoenborn.

Crown lawyer Sheri Mark told the judge that Schoenborn's blood was found on clothing, splattered in the hallway, smeared in the bathroom and covering a long-bladed kitchen knife in the master bedroom.

Powers, who is hearing the case without a jury, has already heard that five-year-old Cordon and eight-year-old Max were suffocated, while their sister, 10-year-old Kaitlynne, was stabbed to death. The judge was told that much of the blood found in Kaitlynne's bedroom was her own.

Schoenborn, their father, is on trial on three counts of first-degree murder.

Under questioning from defence lawyer Peter Wilson, Clark said Schoenborn had injuries to both his forearms and hands when he was found later wandering in the woods.

"There was evidence that some kind of clean up had been conducted?" Wilson asked after reviewing pictures of the bathroom in the home where the children were killed.

"It did appear, the water was diluted (with blood) and there was soap with blood on it," Clark replied.

Pictures of the scene also indicate that Schoenborn left behind warm clothing and his wallet -- which contained a credit card, his identification and pictures of this three children.

Schoenborn was a fugitive for more than a week before he was spotted, hungry and dehydrated in the woods.

The first man to come across him told the court on the second day of the trial it was the family dog that convinced him this was the suspect police were looking for.

Pat McCoy lived on the same street as the children, who were found murdered in their home on April 6, 2008.

He testified that he first recognized the family's dog and then saw a man curled up under a coat in the woods just a few hours' walk from the home.

"I saw a green coat with feet sticking out of it."

McCoy was running back to alert police when he met up with local hunter Kim Robinson, who took out his rifle and approached Schoenborn.

He had been missing for 10 days since the children's mother found them dead in her trailer.

Under cross-examination by Wilson, McCoy said he saw injuries on Schoenborn's arms when he came across him in the woods.

"He had a good gash on his left forearm," McCoy replied.

The deaths rocked the small ranching community of Merritt, located about 270 kilometres northeast of Vancouver.

Before the murders, Schoenborn had several run-ins with the law.

Police arrested him three times in the week before the murders, including for allegedly uttering threats at his children's elementary school, and there was a restraining order restricting him from contact with his wife.

The trial, which is taking place in a Kamloops, B.C., courtroom, is scheduled to last about a month.