Lloyd Harbor police received a call reporting a possible intentional drowning about 3:45 p.m. Wednesday and found the victim's body in the backyard of the White Hill Road home, Police Commissioner Timothy Sini said at the news briefing.
Police in Suffolk County believe she was intentionally drowned in their backyard pool in Cold Spring Harbor.
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Celebrities live throughout the affluent Long Island neighbourhood, including singer-songwriter Billy Joel, Fox News anchor Sean Hannity, and the Bee Gees co-founder Robin Gibb.
Cullen Jr., 23, who was charged with second-degree murder, lives with his parents at their home on White Hill Road in Cold Spring Harbor, a wealthy enclave on the North Shore. Gen. George William Casey, the highest-ranking officer to die in the Vietnam War.
The body of 63-year-old Elizabeth Cullen was discovered around 4 p.m. Wednesday afternoon when police conducted a welfare check.
Cullen Jr. had no previous criminal history and did not resist arrest, police toldCBS.
Cullen's father is a Managing Director at RBC Capital Markets, a social media profile suggests. Elizabeth Cullen ran Winn Collen Interiors out of Cold Spring Harbor.
The homicide investigation is ongoing.
He is set to be arraigned at Suffolk County Court later on Thursday.