Little is known about Pendelbury's background. At an unknown point in time, Pendelbury trained as a police officer and began serving with the Los Santos Police Department.
Events of GTA San Andreas
By 1992, Pendelbury was working in the Internal Affairs department of the LSPD. During this time he had uncovered evidence of corruption against police officers Frank Tenpenny and Eddie Pulaski, both high-ranking officers in C.R.A.S.H., an LSPD unit tasked with the reduction of gang-related violence in Los Santos. Tenpenny, Pulaski and their new associate, Officer Jimmy Hernandez, eventually caught him. They took him to a secluded area in the dock area of Los Santos, where Pulaski assaults him despite Hernandez's pleading of otherwise as Pendelbury was a cop. Before Pulaski can kill Pendelbury, Tenpenny restrains him and instead orders Hernandez to kill Pendelbury. Hernandez initially refuses but, after being threatened with his own death by Tenpenny, reluctantly shoots and kills Pendelbury.
Tenpenny, Pulaski and Hernandez framed Carl Johnson for the murder of Officer Pendelbury, which allowed them to manipulate Carl for a period of time. Tenpenny and Pulaski were later both charged with the murder of Pendelbury, although Carl Johnson had already murdered Pulaski. Tenpenny was cleared of all charges due to lack of evidence, which effectively set off the Los Santos Riots, which led to his death.
Later, when Carl Johnson reaches Las Venturas, Mike Toreno tells him about Pendelbury's death at the hands of Officer Tenpenny, implying that Jimmy Hernandez told the Internal Affairs about the murder, but did not mention that he was the one who held the gun.