A toddler died Sunday after he was left in a van for an hour in 100-degree heat in front of his family’s house in the Savannah area.

Sixteen-month-old Markus Anthony Lewis died Sunday afternoon at Children’s Medical Center Dallas, according to records from the Dallas County medical examiner’s office.

Denton County sheriff’s deputies and an Aubrey ambulance responded to the 1300 block of Pinehurst Street about 2:40 p.m., said Sheriff’s Sgt. Roger Griggs. They found the child unconscious, and Aubrey paramedics called for a CareFlite helicopter to take him to the Dallas hospital, where he died at about 4 p.m.

Griggs said the parents and their three sons had been visiting a water park in two vehicles.

The father, a 10-year-old son and a family friend were in one car, Griggs said. The mother was in a minivan with their 8-year-old son and the 14-month-old.

“After they left the water park, the father and the occupants of his car went to the Sonic to buy lunch for the family,” Griggs said. “The mother went home and unloaded all their gear from the van. It wasn’t until the father came home that they realized the baby was still in the van.”

The child was unconscious by then, the sergeant said. Efforts by medical personnel were not successful in reviving the boy.

Griggs said an investigation is continuing into the incident.

The Savannah subdivision lies east of Denton on U.S. Highway 380 in an unincorporated part of the county.

DONNA FIELDER can be reached at 940-566-6885. Her e-mail address is dfielder@dentonrc.com .