Girl's slaying baffles police SAN LEANDRO - A father who came home from work last week to find his 14- year-old daughter stabbed to death said he had believed his home was a place for love and warmth. "But now the shelter is broken, the love is gone, and it only feels cold and scary," John Lin said Tuesday. Jennifer Lin, a popular eighthgrader, was 1 killed Friday in an upstairs bathroom of her Castro Valley home. Her father found her body about 6:45 p.m. Lin, 45, spoke about his daughter's murder for the first time at a news conference at the Alameda County Sheriff's Office. The murder has perplexed invesent tigators motive. who do The not t home have an appar;, was robbed and there was no sign of struggle. Though the body was only partially clothed, there was no sign of sexual assault. "We cannot imagine how Jenny could be the target of such a murder," Lin said. "Because we don't know what the motive was, and neither do the police, we are " scared." Sheriff's Lt. Ted Nelson said authorities still don't have any Jennifer Lin speaks of his loss ASSOCIATED PRESS John Lin appeals to public Tuesday for clues to his daughter's death. At right is Sheriff's Sgt. Jim Knudsen. major leads in the killing. A young man riding a motorcycle and wearing a leather jacket was' seen in Lin's quiet, affluent neighborhood Friday afternoon, passing out leaflets. Authorities hope to find the man and question him. Authorities believe Jennifer's attacker was a man, because it appeared she was quickly overpowered. Investigators also believe Jennifer did not know her attacker, but they won't discuss details. "Jenny was a very sweet and intelligent girl. liked and enjoyed her friendship," Lin said about his daughter, a straight-A student at Canyon Middle School. "She was full of love and happiness and was such a sweetheart. She was our life and we lived for her."