Three of the nine inmates who escaped from Baltimore County's new computer-controlled jail in Towson Saturday night have been captured, including one who walked back to the jail yesterday, saying he was sorry he had escaped.

The inmate, identified as David Gerald Knight of Laurel, "decided it wasn't worth it," said a Baltimore County police sergeant, who said Knight knocked on the jail door at 1 p.m. An escape charge against Knight was added to an existing charge of breaking and entering.

More than 35 county, state and city police units are conducting an air and gound search for the six remaining inmates. The escapees still at large include an armed robbery suspect and Tyrone Harrell, 33, who was awaiting sentencing for first-degree murder.

One of the escapees who was recaptured by police fell 30 feet when the knotted bedsheet rope used in the jail break tore. The inmate, identified as Jody Saunders, 20, was in critical condition yesterday at University Hospital in Baltimore as a result of injuries he suffered in the fall, police said. Saunders was in jail awaiting trial on a robbery charge.

An hour after the escape, police captured Russell Baker, 31, of Baltimore as he walked along a highway in Towson in his dark blue prison overalls. Baker was awaiting trial for breaking and entering.

The inmates escaped by breaking a third-floor window, which was made of bulletproof glass and did not have bars over it, and climbing down a 35-foot rope of knotted bed sheets, police said.

When the $11.5 million jail opened last December, Warden Mark Levine said inmates would have to tear a wall down to break through the bulletproof glass windows. But Baltimore County Sheriff Charles H. Hickey Jr. said the inmates set fire to the window by smearing it with a flammable substance