Who is bosko on the mentalist?

Bosko is a cat that Patrick Jane keeps after getting it as a present from Red John, although it was likely originally intended for Teresa Lisbon rather than Patrick. The cat frequently plays a role in episodes due to it frequently getting out and having to be rescued due to Jane leaving the windows of his trailer, where the creature resides, opened. Bosko appears to only like Red John and Jane. Red John's accomplice later kills the feline before it could be used as evidence against the serial killer himself but was found by the CBI team, thus confirming to Teresa and Patrick as well as their coworkers Red John's true identity as Lorelei Martins.