A Florida man is accused of fatally shooting his own mother after she told him to stop smoking in his bedroom, WFLA-TV reports.

Authorities say the incident happened Thursday morning in Lake Wales, Florida, a city between Tampa and Orlando.

The 52-year-old victim, whose name has not been released, had just returned home after bringing her 14-year-old daughter to school when she smelled cigar smoke emanating from the bedroom of her 19-year-old son, Seth Settle.

The woman went to Settle’s bedroom, asked him to stop smoking and then shut the door, at which point Settle allegedly fired a gun through the door, causing a bullet to strike the woman’s heart.

“I can’t begin to tell you the horror of this event,” Sheriff Grady Judd told reporters at a news conference, according to WFLA-TV. “This is truly the wonderful family next door, and he kills his mom.”

Settle reportedly ran through the house and yelled to get the attention of his 24-year-old brother, who was using a bathroom at the time and did not hear what was said.

But instead of staying to help his mother, Settle fled the home and went to see a friend, allegedly telling the friend that he had accidentally shot his mom.

After the older brother left the bathroom, he came upon his mother and found her unresponsive. But he didn’t know what happened because he hadn’t heard the gunshot and his young brother was nowhere to be found.

Medics and police on scene did not know what caused the woman to collapse because there was no blood visible at the scene.

It was only when hospital staff began moving the woman’s body around did blood become visible, which led to the discovery of the gunshot wound, according to the television station.