A 65-year-old Las Vegas man, Michael Winkler, has been arrested after allegedly becoming heavily intoxicated, falling asleep, and leaving four dogs locked inside a parked car for hours—ultimately resulting in their deaths.

Winkler, who has a known history of animal cruelty, was taken into custody on June 12 and charged with four felony counts of willful or malicious torture, maiming, or killing of an animal, according to the Las Vegas Metropolitan Police Department.

The dogs—Snickers, Oakley, Ben, and Angel—were found dead in Winkler’s vehicle, which had been parked in his garage, according to a necropsy report obtained by the Las Vegas Review-Journal. The animals died from heat stroke, suffocation, or a combination of both.

Family members told investigators they believed Winkler had been “plastered” and forgot the dogs were still in the car. His teenage granddaughter, who lives in the home, said she came back around 1 a.m. on May 14 and noticed the car windows were fogged up. When she looked inside, she saw Angel, one of the dogs, unresponsive in the driver’s seat.

Inside the home, she found Winkler naked and severely intoxicated, according to the police report. She immediately called her mother, who rushed home from work. Upon arrival, Winkler’s daughter contacted 911 to report the dogs’ deaths and request medical help for her father, who was incoherent and had soiled himself.

“[She] is sure those dogs went into the vehicle alive, but her grandfather is just lazy, and most likely left them trapped,” investigators quoted in the arrest report.

Both the daughter and granddaughter told police that Winkler had previously caused the deaths of other dogs under similar circumstances. They said they had reported him to animal control in hopes of preventing him from keeping more pets.

Investigators revealed that six dogs have died in Winkler’s care over the past four years. During this most recent investigation, Winkler reportedly handed over a notebook in which he admitted to neglect.

Despite the severity of the charges, Winkler was released the day after his arrest and ordered to remain out of legal trouble. He is scheduled to appear in court on July 14.