He married Megan Montgomery in February 2019. On February 23 they were involved in a violent domestic incident at a home on the 2300 block of Village Center Street in Ross Bridge during which Montgomery suffered a minor gunshot wound to her arm. McIntosh had called 911 to report the incident, claiming that the couple had been struggling over control of the gun when it went off. Judge Lorraine Pringle granted a dual protective order on March 4 that McIntosh and Montgomery should not contact each other.
The Hoover Police Department placed McIntosh on leave while the Alabama Bureau of Investigation completed its internal investigation into the matter. He resigned from the department on March 20, before the investigation was concluded. The ABI's findings, which suggested that Montgomery was the aggressor, were turned over to the Jefferson County District Attorney, which declined to file criminal charges.
On May 5 police again responded to a domestic violence call at the Ross Bridge home. Montgomery had suffered superficial wounds and refused medical treatment. McIntosh was arrested and charged with third-degree domestic violence. He was released on $1,000 bond. Afterward he worked as a delivery driver for Waitr.
On the evening of November 30, after the 2019 Iron Bowl, McIntosh approached Montgomery who was with friends at Courtyard 280 Oyster Bar & Grill. They left together. Her body was found the next day in the parking lot of the Mountain Brook Athletic Complex. She had been shot several times. Before the end of the day, police had issued an "officer safety" bulletin to other agencies, describing McIntosh as having, "made threats of violence and mass shooting in the past. He is considered to be armed and dangerous."
McIntosh, escorted by attorneys Tommy Spina and Ben Preston, surrendered to Mountain Brook Police Department on December 2. Because of the protective order, McIntosh was charged with capital murder. On March 31, 2021 McIntosh pleaded guilty to the reduced charge of felony murder before Judge Shanta Owens. He was sentenced to 30 years in prison.
- Robinson, Carol (May 6, 2019) "Ex-Hoover officer involved in February shooting at home arrested in new domestic violence case." The Birmingham News
- Robinson, Carol (December 4, 2019) "Megan Montgomery shot multiple times; Mountain Brook police charge ex-cop with capital murder." The Birmingham News
- Robinson, Carol (March 31, 2021) "Ex-police officer Jason McIntosh pleads guilty to Megan Montgomery’s Mountain Brook murder." The Birmingham News