A Delaware wife allegedly shot a woman she believed was having an affair with her husband in an ambush that ended in a murder-suicide, police said.

Radnor Township Police in Pennsylvania said Jennair Gerardot, 48, meticulously planned the grisly slaying Monday night that left 33-year-old Meredith Chapman dead, according to the Philadelphia Inquirer.

“[Gerardot] went to great lengths to disguise herself,” Police Superintendent William Colarulo said. “She wore a wig, and took a train from Delaware to Radnor. She broke into the victim’s house, and cleaned up the glass so the victim didn’t realize someone was in her home.”

Police said Gerardot shot Chapman around 7 p.m. when she walked in the door. The jilted wife then turned the gun on herself.

The alleged assailant’s body was found near the kitchen, not far from Chapman’s, news station WACU reported.

Gerardot’s husband reportedly alerted authorities that they may find his wife inside the crime scene.

“There were emails and text messages indicating what [Gerardot] might do,” Colarulo told WACU.

Her husband, Mark Gerardot, worked at the University of Delaware, where Chapman was previously employed before starting a new job as assistant vice president at Villanova University.

Chapman also unsuccessfully made a bid for a state Senate seat in Delaware in 2016. Her husband, Luke Chapman, was also involved in politics as a former Newark city councilman.