Timothy Fradeneck listened with a silent stare during his preliminary examination as Eastpointe police took the stand.
Prosecutors asked officers why Fradeneck, 37, said he strangled his wife and two kids.
"He stated that he did not think his family could take the heartache of him taking his own life," said Det. Matthew Hambright to the court.
Police say Fradeneck admitted to killing his wife, 37-year-old Christie Fradeneck, and their two children, Celeste, 2, and Timothy, 8, known as Trey, one-by-one, using a USB cord last month. Police discovered their bodies during a welfare check.
Fradeneck is charged with three counts of first degree murder, felony murder and two counts of child abuse.
Police say Fradeneck confessed to planning their murders since August.
The defense argued that Fradeneck was under the influence. Police did testify Tuesday that they could smell marijuana and saw bottles of pills in the home.
The defense argued that Fradeneck took roughly 28 pills, most of which he regularly takes to treat his bipolar disorder before committing the murders.
However, by the end of the hearing, a judge found that Fradeneck will head to trial to face all seven counts.
Fradeneck's attorney Steve Kaplan, "says that during that day, he was insane. He lacked criminal responsibility."
Fradeneck will be in court June 15 for a competency hearing.