A 6-month-old baby who was killed when a gunman fired at minivan in Chicago was on her father's lap at the time, Police Superintendent Garry McCarthy said Monday.

The father, Jonathon Watkins, was seriously wounded when the shooter approached the vehicle and fired. McCarthy said that Jonylah Watkins was sitting in his dad's lap in the driver's seat — a change from previous reports that Watkins was changing the baby's diaper at the time.

McCarthy also said the baby was shot once, not several times as previously reported.

"We are going to close this case, there's no doubt in my mind," said McCarthy.

McCarthy previously described the 28-year-old Watkins as a gang member with a long criminal history.

"At this point there's a lot more he can help us with, but (he) is cooperating with the investigation," McCarthy said.

Read it at ABC News.