The FBI, the Lake County state’s attorney’s office and the Lake County Major Crime Task Force are investigating.

In a press release, Task Force Commander George Filenko said the agency is chasing about 50 leads into circumstances surrounding Howell’s death. He also stated that the investigation could take another week or two, the Sun Times reports.

Howell’s family has likened the situation to that of Walter Scott, a South Carolina man who was shot in the back by a police officer earlier this month.

“There is no difference between the murder in South Carolina and the murder of my grandson,” said Alice Howell. “I am anxiously waiting for the conclusion of the investigation.”