The building was evacuated during the three-hour standoff that began at about 1 p.m. Wednesday.
Sgt. Michael Danpf says Catts was released from prison in 2007 after serving three years for sexual abuse.
The detective was treated and released from a hospital. His name isn't being released.
Poughkeepsie is about 70 miles north of New York City.
NEW YORK AND TRI-STATE AREA NEWS
USEFUL LINKS: