ST. ANN • A man police say overdosed on heroin while driving in St. Ann on Tuesday afternoon struck and seriously injured a couple and their toddler as they were crossing the street.

The man, who is in his 20s, nodded off behind the wheel of his Mazda 3 at the intersection of Ashby and St. Charles Rock roads about 3:45 p.m., said St. Ann Police Chief Aaron Jimenez. The car, northbound on Ashby, accelerated to the left and struck the couple as they pushed their son in a stroller across the road.

The 2-year-old boy in the stroller was thrown about 8 to 10 feet from it while the mother landed on her head, Jimenez said. The father suffered a serious leg injury.

Paramedics twice used Narcan, a drug used to counteract an overdose, to revive the driver, Jimenez said. He was revived and was taken into custody to face charges. Jimenez said the couple are in their mid-20s.

"This is another case of people abusing heroin," Jimenez said. "It's an epidemic."