A 36-year-old man remains in custody today on suspicion of gross vehicular manslaughter while intoxicated for a hit-and-run crash Friday night in San Francisco that killed a bicyclist. Police said 21-year-old Nils Linke, who was visiting the U.S. from Germany, was biking south on Masonic Avenue near Turk Street at about 10:40 p.m. Friday when a southbound, older-model Mercedes-Benz hit and killed him. The driver of the Mercedes, Joshua Calder, allegedly drove away from the scene after the crash, according to police. Witnesses provided police with a description of the car, and officers found it and arrested Calder about two blocks away, police said.Police believe Calder is an Oakland resident, though he said he lived in San Francisco when he was booked into jail. In addition to the manslaughter charge, Calder was also booked on suspicion of drunken driving, felony hit-and-run causing death, and a misdemeanor charge of having no proof of auto insurance, police said.