02/18/2016 09:53 EST | Updated 02/18/2017 00:12 EST

Mom of accused Edmonton killer testifies he was paranoid, heard voices

RED DEER, Alta. — The mother of an Edmonton man accused of killing his girlfriend says her son was paranoid and heard voices.

Mark Lindsay, who is 29, is charged with second-degree murder, offering an indignity to a body and obstruction in the death of 31-year-old Dana Turner in August 2011.

Lindsay's mother testified that he started showing signs of paranoia in 2006 and that it got worse over the years.

She said Lindsay told her in March 2011 that there was a plot to kill him because he heard it being broadcast on his neighbours' TV.

Lindsay, who is the son of former Edmonton police chief John Lindsay, sobbed softly in the prisoner's box and wiped tears from his eyes while his mother testified.

An agreed statement of facts read into the record states Lindsay stabbed Turner in the eye with a pencil, then strangled her with a shoelace.

The statement says he drove to a construction site, where he drove over Turner's body, then dumped her near a road in Innisfail.

Lindsay is being tried by a judge alone and the defence is arguing he should not be held criminally responsible.

On Wednesday, court heard that Lindsay said he killed Turner because he believed she was part of a group of serial killers that were out to kill him.

A psychiatrist is also scheduled to testify in Lindsay's defence.