PENN HILLS, Pennsylvania (AP) -- Police on Wednesday were searching for an 18-year-old man charged with stabbing his 11-year-old twin brothers, killing one of them and leaving the other seriously injured.
A warrant accuses Troy Lavalle Hill, 18, of killing one twin and attempting to kill the other.
The boys' grandfather, Lovett Williams, said he found Tyron Hill dead and Tyrel Hill wrapped in a blood-soaked blanket in the attic of their suburban Pittsburgh home when he went to check on the boys Tuesday.
"There was blood everywhere," Williams said. "Everywhere. Blood all over the house. Downstairs, up the steps."
The surviving twin identified his older half-brother, Troy Lavalle Hill, as the attacker, police said.
Allegheny County Police Assistant Superintendent James Morton said authorities believe Troy Hill has emotional problems, but Morton stopped short of suggesting a motive for the attacks.
Police charged the teenager with criminal homicide and attempted homicide and said he should be considered armed and dangerous.
Police and other searchers combed the neighborhood and nearby woods with dogs and thermal imaging devices Tuesday evening, but could not find him.
Allegheny County police Superintendent Charles Moffatt said Wednesday that Troy Hill's biological mother lives in Woodbridge, Virginia, and they were considering asking her to make a public appeal for Hill to turn himself in.
Troy Hill played football for Waynesburg College last season but did not return for the fall semester.
"All I know is he's been depressed lately," Williams' wife, Clem Williams, said Wednesday. "I don't know what happened when the boys got home from school."
The three brothers lived with their parents and a 3-year-old sister in Penn Hills, about five miles east of Pittsburgh. The little girl was not home when the twins were stabbed, Clem Williams said.
The grandparents live near the family and went to check on the twins after their mother tried calling the house from work and got no answer, police said.
"I just know they were a lovely, close-knit family," said neighbor Marlene Hogan. "All the boys were great. The twins were the sweetest kids."
Penn Hills School District officials said grief counselors were available Wednesday at Linton Middle School to help the boys' classmates cope. The surviving twin, Tyrel, was in critical condition at Children's Hospital of Pittsburgh and was expected to recover, Morton said.
"I don't know how I'm going to make it," Lovett Williams told reporters. "I moved here so I could be with my grandsons. I hope I can survive. As long as (Tyrel) makes it, I might make it, too."
Photo of the killer (Troy Hill): http://i.l.cnn.net/cnn/2007/US/08/29.../art.twins.jpg
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