CLEVELAND, Ohio - The Cuyahoga County Sheriff's Department has completed its investigation into the November Cleveland police killing of 12-year-old Tamir Rice, sources familiar with the case said.

The department is expected to announce that investigators have given the evidence they collected to Cuyahoga County Prosecutor Tim McGinty's office on Wednesday, more than six months after Cleveland police officer Timothy Loehmann shot and killed the boy who had wielded an airsoft-type gun in Cudell Recreation Center Nov. 22.

The sheriff's department will not recommend whether any charges should be filed against Loehmann or his partner, Frank Garmback, sources said. McGinty's office will review the evidence and present it to a grand jury, a process that could take weeks.

A team of sheriff's department detectives, led by then-Chief Deputy Clifford Pinkney, took control of the investigation Jan. 2, after the city agreed to let an outside agency probe the shooting.

The sheriff's department started investigating Feb. 13, after prosecutors removed legally protected statements Cleveland police officers made to internal investigators from the police department's file, Pinkney, who has since been appointed sheriff, said at a May 12 press conference.

Tamir's mother, Samaria Rice, and her attorneys blasted the sheriff's department for the length of the investigation, accusing officials of dragging their feet.

The sheriff's department and prosecutor's office both declined to comment.