Police said Sgt. Weller, 47, died in a car crash in southeastern Will County on Friday. He was off-duty at the time of the crash.
Sgt. Weller was a 20-year veteran of the Joliet Police Department. He was promoted to sergeant in July of 2020, police said.
He is survived by his wife and three children, according to police.
Police described him as a leader, a mentor, and a friend to many.
"We respectfully ask the public to keep Sgt. Weller's family, as well as the men and women of the Joliet Police Department, in their thoughts and prayers during this time of unimaginable loss," a Joliet PD spokesperson said.
The details regarding the deadly crash were not released by police.