As Crown attorney Michael Murdoch laid out the case he plans to make against accused murderer Michael Schweitzer, relatives of Schweitzer’s alleged victim sat uncomfortably in a Stratford courtroom.

“We had to hear things that my sister would have never wanted anyone to hear,” Mason Wagler, the brother of Nicole Wagler, told reporters outside court Tuesday.

“She was a happy, sweet young girl – still a child.”

Nicole Wagler was shot dead in December 2012, inside a home in Milverton.

Living in the home at the time were Tyler Baker, who was found having been shot and critically injured, and Schweitzer.

In his opening address, Murdoch said the relationship between the three was such that the two men both had casual sex with her and “were not gentlemen” as they did so.

Days before the shooting, Murdoch alleged, Wagler refused to have sex with Schweitzer, angering him and prompting him to accuse him of being more interested in Baker.

Murdoch concluded his remarks by claiming that after the shooting, Schweitzer went to his father for help, claiming he had blacked out and couldn’t remember what had happened.

Jurors then heard testimony from Michael Scott, a retired Ontario Provincial Police sergeant.

Scott told the court that there were several 911 calls placed from the house, including one from a man “who had woken up covered with blood, and was injured.”

He later arrived at the house with other officers, all of whom had their guns drawn as they believed there could be an active shooter inside.

By that point, unbeknownst to Scott, Schweitzer and his father were already in the back of a police cruiser.

Baker was still inside, at the kitchen sink with a towel wrapped around his head.

“His face was visible, but completely obliterated,” Scott testified.

“He was moaning ‘Help me.’”

Wagler’s body was in the living room, in front of the fireplace, while there was a shotgun on the floor of Schweitzer’s bedroom.

Under cross-examination, Scott was asked whether Baker’s face looked similar to the faces of suicide victims he had dealt with in the past.

The retired sergeant replied that the similarity didn’t occur to him in the moment, but he recognized it with the benefit of hindsight.

Scott was also asked why Baker’s hands were not checked for gunpowder residue. He said he could not remember.

“Nothing in my notes reflects that instruction,” he said.

The trial continues Wednesday.

Members of Wagler’s family are expected to attend every day of the proceedings.