Devon Fenner of Hempstead is charged with negligent homicide after...

Devon Fenner of Hempstead is charged with negligent homicide after police say his 7-month-old son died after being left in a parked car for 30 minutes. (Aug. 21, 2013) Credit: Howard Schnapp

A 7-month-old Hempstead boy died after being left alone in the backseat of a car on a hot afternoon, and the father who says he forgot about the baby has been arrested.

Devon Fenner, 25, was arraigned Wednesday on a charge of criminally negligent homicide.

Nassau police said Fenner told them he accidentally left his son, Dominick, in the car parked outside his Milburn Avenue home for about 30 minutes Tuesday afternoon. The driver's side window, police said, had been rolled down slightly.

"Unfortunately, cracking the window on a 90-degree day doesn't do much," said Insp. Kenneth Lack, a Nassau police spokesman.

The temperature in the car at the time was 119 degrees, according to the criminal complaint.

Fenner pleaded not guilty in First District Court in Hempstead and Judge Eric Bjorneby set bail at $50,000 bond, or $25,000 cash. Fenner faces up to 4 years in prison if convicted and is due back in court next Wednesday.

"Judge, this case is a tragedy, a tragedy for everyone involved," said defense attorney Maureen McBride of Mineola.

McBride said Fenner has worked steadily for a moving and storage company, and that his prior brushes with the law were nonviolent offenses, such as marijuana possession.

Fenner told officers he returned home in his 2003 Toyota Corolla after dropping his girlfriend off at work shortly after 1 p.m. Tuesday. He said he parked in front of his house and went inside.

About a half-hour later, he realized his son was still in the car. He went to get him and found the child had stopped breathing, police said. Fenner said he called 911. Hempstead Village police and medics found the baby "unconscious and unresponsive" and started CPR, police said.

Dominick was declared dead about 2:30 p.m. at Mercy Medical Center in Rockville Centre, and the father was arrested about two hours later.

Officers found a small amount of marijuana on Fenner, and that will be presented to a grand jury along with other evidence in the case, Lack said.

Lack said the baby likely died of heat exposure, but an autopsy will determine the cause of death.

The temperature was 85 degrees at 1 p.m. Tuesday in Farmingdale, the closest National Weather Service recording station to Hempstead.

In warning people not to leave children and pets in cars on hot days, the weather service recently tested a vehicle's internal temperature on a typical summer afternoon. The heat inside the car soared from 89 degrees to 107 in just 20 minutes, according to Upton meteorologist Joey Picca.

Fenner has prior arrests for misdemeanor drug offenses and criminal trespassing, records show. The cases ended in fines and conditional release.

Nassau's social services agency is investigating the circumstances involving Fenner's surviving children -- an 8-year-old son who does not live with him, and a 7-year-old son who does, Lack said.

Friends and relatives of Fenner's, some of whom attended Wednesday's arraignment, declined to comment.

Stunned neighbors said they were unsure how many people lived in the house, which isn't owned by the Fenner family. "It's unbelievable," said Jocelyne Antione, 58, who lives across the street. "I can't understand how this could have happened."

With Ellen Yan,

Fausto Giovanny Pinto

and Gary Dymski

A trip to the emergency room in a Long Island hospital now averages nearly 4 hours, data shows. NewsdayTV's Virginia Huie reports. Credit: Newsday Staff

'I'm going to try to avoid it' A trip to the emergency room in a Long Island hospital now averages nearly 4 hours, data shows. NewsdayTV's Virginia Huie reports.

A trip to the emergency room in a Long Island hospital now averages nearly 4 hours, data shows. NewsdayTV's Virginia Huie reports. Credit: Newsday Staff

'I'm going to try to avoid it' A trip to the emergency room in a Long Island hospital now averages nearly 4 hours, data shows. NewsdayTV's Virginia Huie reports.

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