Priestley tells PEOPLE ... her death in July It was hard for Jason Priestley to reconcile how sick Shannen Doherty really was — even during his final visit before her death in July.

Jason Priestley ... with Priestley from 1990-95 and again in 1998 until 2000. At Saturday’s event, Priestley also said he felt Perry still had so much left to do in life before his death.

Jason Priestley wants to be there for his friend in her time of need. Priestley opened up to PEOPLE about supporting his former Beverly Hills, 90210 costar Shannen Doherty amid her cancer battle ...