MARIETTA, Ga. — The suburban Atlanta father whose toddler died in June after being left in a hot vehicle was indicted Thursday on murder charges.

The indictment against the man, Justin Ross Harris, by a Cobb County grand jury includes a charge of malice murder, for which a death sentence can be sought. Mr. Harris also faces counts that include felony murder, cruelty to children and dissemination of harmful material to minors.

Mr. Harris, who was arrested hours after his 22-month-old son, Cooper, died on June 18, has been held without bond.

The Cobb County district attorney, D. Victor Reynolds, said his office would decide this month whether to pursue the death penalty. “We are pleased with the pace and the thoroughness of this investigation, which continues on today,” Mr. Reynolds said at a news conference. “The evidence in this case has led us to this point.”