Yes, Grace Nelson was a singer. She recorded songs (several 7"s + 1 LP) that had committed lyrics right before it became really trendy again. I remember seeing some of them reviewed favourably in Echoes. They have stood the test of time rather well.
As for Ari, well, maybe she wasn't the typical reggae artist but there is more to her than what she did with The Slits. She recorded reggae and dancehall in NYC and JA, lived in JA for a long time, got a child there, was a tv host AND a dancehall queen as Medusa. That's rather more credentials than what many could show, isn't it?
It's Scooby Santino, not Santini!
Besides, there is an error with Jim Kelly. It's the gangster don nicknamed JK who is dead. The DJ with the same alias - who then changed it for obvious reasons - is very much alive!
2 more additions:
Baby Wayne (DJ - 10/29/2005 - pneumonia)
Trevor Sparks (dancehall singer -Jammy protegee- 3/23/2005 - heart attack?)
Some other errors:
Mikey Simpson certainly didn't die in 1994. The last 7"s on his label turned up in 1998.
Norris Reid is definitely not dead: he has just recorded a brand new album in france and done a few dates there and one in italy in july!