Neff, a white maintenance man, was helping a black family in Beaumont, Texas where he was murdered.
The victim was stabbed multiple times, police say.
Arrested is 17-year-old Samuel Thomas, IV. Police say Thomas covered the body with a sheet after the murder, then stole his victim's truck.
Neff was discovered when the grandson of Theresa Jackson, who lives at the house, went out to play. The confessed killer is Jackson's son.
Reports say the women surrendered the butcher knife from her kitchen that police believe is the murder weapon. She indicated her son had a history of mental disorders.
Neff's daughter, Haley, had just returned from a tour of duty in Afghanistan when her father's remains were discovered.
Neff was 59 year old.
The murdered occurred on Monday, April 7, 2014.
UPDATE: Murder suspect's mother turns butcher knife over to police ►
Police make arrest in stabbing death ►
Servicewoman returns home to learn of father's murder ►
12 News KBMT and K-JAC. News, Weather and Sports for SE Texas
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