Diamond, 39, his widow Berenice, 37, and their 4-year-old daughter Britney were shot in their sleep after gunmen entered their home on Saturday night.
Diamond died in hospital on Sunday while Berenice and Britney were receiving treatment. Two men were taken in for question regarding the incident.
CPF chairperson Charles George said: “Unfortunately, our area is still bleeding with six people murdered in different incidents and some injured at the weekend.
"At this point we need people to avail themselves and join neighbourhood watches because we have 17 members and need about 100.