When Tacoma gang member Bernard Houston died, fellow gang members even made up sweatshirts reading: ``R.I.P. (rest in peace) Clown,'' Houston's street name. Two years ago, Houston, 17, was the first gang member to die in Tacoma. He was found with a bullet in his head and a loaded pistol in his hand. Police believe members of a Los Angeles-based. But in Tacoma, which once had a problem so severe the F.B.I. took note, gang-related violence has declined by 70 percent, according to data from the city's police department.