The beating of San Francisco Giants fan Bryan Stow was transfered by the Los Angeles Police Department to a unit that handles high-profile cases.
Stow, a 42-year-old father of two, was attacked outside Dodger Stadium after the Opening Day game on March 31 against the Giants. He is still in a coma as a result of injuries sustained in the attack.
The probe into the beating had been coordinated by detectives from the LAPD's northeast division, but on Wednesday the department said its central robbery-homicide unit is taking over.
The paper quotes the police as saying that long and complicated investigations are often handled by the robbery and homicide detectives.
More than two weeks after his arrest, the main suspect in the case, Giovanni Ramirez, has not been charged and is only being held on a parole violation for a weapons infraction.
His attorneys say he has an alibi for the time of the attack.
The Associated Press contributed to this report.