The females, Grimus (1996) and Guni (1999) were euthanised on medical grounds (due to old age) and the male, Chad (2005) was euthanised due to being unable to integrate with Melbourne’s troop.
From my post last year (21/11/2023):
The three baboons from Perth Zoo are now all deceased. Grimus (1996) and Guni (1999) were euthanised on medical grounds (old age); while Chad (2005) was euthanised due to being unable to integrate with Melbourne’s troop. It should be noted the introduction of unrelated males is extremely difficult to achieve and it’s commendable Melbourne Zoo gave him every opportunity to do so (as opposed to only accepting the females from Perth).
That's unfortunate that he didn't integrate well he probably would of had a good application as a breeding male. I wonder if going forward the zoo will be more alert when trying to introduce new males or will they only stick to introducing new females as a result.