Bristol (AP) — Police divers have returned for a second day of searching a lake in the hometown of Aaron Hernandez, the former New England Patriots player who is charged with murder.

Authorities have declined to comment on the search at Pine Lake, a 54-acre man-made lake in Bristol, except to confirm it is related to the Hernandez investigation.

Hernandez has pleaded not guilty to murder in the death of Odin Lloyd, a 27-year-old Boston semi-professional football player whose body was found June 17 about a mile from Hernandez's home in North Attleborough, Mass.

Authorities believe Lloyd was killed with a .45-caliber Glock, which hasn't been recovered.

Divers spent eight hours Monday at the lake, which has an average depth of 4 ½ feet, and is just 12-feet at its deepest point.