Conservationists slammed the bill as incentivizing the "cruel deaths" of more than 1,000 wolves.
In a national first, Colorado voters approved Proposition 114, ordering the state wildlife agency to reintroduce the gray wolf within their borders.
Environmentalists and advocates for animals have vowed to challenge a decision stripping federal protections from wolves in the lower 48 states.
The death of OR-54 in California has been called a "tragic development" by environmentalists.
The U.S. Fish and Wildlife Service and an environmental organization offered money in a bid to crack the tough case.
The Lassen Pack is now up to at least seven, according to state wildlife officials.
A cave lion cub and a massive mammoth's foot also were recently found in melting permafrost.
The red wolf nearly disappeared when FWS stepped in, bred them in captivity and reintroduced them within their historic range