UPDATED: Sept. 5, 2014 2:55 p.m.

PALMER PARK, Md. (WNEW) — After almost a month of searching, police have raised the reward for a man wanted in the fatal shooting of a 3-year-old Landover girl.

The reward is now $45,000 for any information leading to the capture of Davon Wallace, a 25-year-old Prince George’s County man.

Wallace is wanted for the August 10 killing of 3-year-old Knijah Bibb.

Prince George’s County Police Chief Marc Magaw believes someone is harboring Wallace and warns, if that’s the case, the person or people involved face prosecution as well. The FBI has joined local police in the search.

Authorities also suspect Wallace has crossed state lines and have extended their search. Digital billboards are now showing Wallace as a wanted man.

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WNEW Annapolis Bureau Chief Karen Adams contributed to this report. Follow her and WNEW on Twitter.