INDIANAPOLIS (WISH) — The semi driver who killed a mother and her twin daughters in a crash on I-465 will be sentenced next month.

Bruce Pollard pleaded guilty but mentally ill to reckless homicide and reckless driving last month. The formal plea agreement was entered in court and accepted by a judge Friday. Pollard’s sentencing date has been scheduled for March 27.

The crash happened around noon July 14 in the eastbound lanes of I-465 on the north side near the Keystone Avenue interchange. Pollard, driving a semi carrying metal shelving, plowed into stopped traffic at a high rate of speed, hitting six cars and overturning a truck, police said. Alanna Koons, 29, and her twin, 18-month-old daughters, June and Ruby, died int he crash. Seven other people were sent to area hospitals, police said. 

Based on the investigation, Pollard’s semitrailer is believed to have been travelling at 65 mph at the time of the crash, prosecutors said. The crash occurred within an active construction zone with a speed limit of 45 mph.