Nassau County Police were called to the Anthony House on East Roosevelt Avenue in Roosevelt at about 10:30 Friday night.
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The victim, 70-year-old Patrick Logsdon, was pronounced dead at the scene.
Police identified the suspect as 47-year-old Andre Patton, a resident of the home.
There is no information yet on the motive for the attack.
"He stabbed a 70-year-old man multiple times in a religious place that gives hope to those people who are going through substance abuse or homeless, so he's dangerous," said Nassau County Police Commissioner Patrick Ryder.
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No one else was injured in the incident.
The facility is a halfway house for men who have gotten out of prison or are battling substance abuse.
It is run by the Society of St. Vincent de Paul, a Catholic volunteer organization under the auspices of the Diocese of Rockville Centre.
Detectives request anyone with information to contact Nassau County Crime Stoppers at 1-800-244-TIPS.
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