Andy Berthelsen said his neighbour Adam Purinton, who is charged with murder and attempted murder in Wednesday night's attack, was very close to his father, who died of pancreatic cancer.
He said in the past year, Purinton bounced from one menial job to the next and was sometimes drunk by mid-morning. But in the 15 years he's lived across the street from Purinton in Olathe, Berthelsen said he's never heard him make a racist remark or talk politics.
"This is someone who's gone downhill very quickly," Berthelsen told The Associated Press by phone yesterday. "He was a drunken mess."
Purinton, 51, was arrested hours after the attack at a restaurant and bar about 110 kilometres from Olathe in Clinton, Missouri.
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He is jailed on murder and attempted murder charges, and he didn't have a lawyer as of yesterday, according to court records.
His first court appearance is scheduled for tomorrow.
Purinton's mother, Marsha Purinton, told The New York Times that her son "snapped, and this is not his typical self." The newspaper said she declined to elaborate, and calls by the AP to a home listing believed to be hers got a busy signal.
Srinivas Kuchibhotla, a 32-year-old engineer at GPS device-maker Garmin, was killed. His friend and colleague, 32-year-old Alok Madasani, and a man who tried to intervene, 24-year-old Ian Grillot, were wounded. Madasani was released from the hospital Thursday. Grillot remains hospitalised.
Authorities on Friday declined to discuss a possible motive for the attack or to say if they were investigating it as a possible hate crime. But Madasani's father in India described it as such, and the incident has stoked fears about the treatment of immigrants, who feel targeted by President Donald Trump's promises to ban certain travelers, build a wall along the Mexico border and put "America first."