I am sooo glad her killer has been found.
Some time ago, an off-duty cop saw him acting suspiciously somewhere in Howard Beach, and called the local precinct.
The suspect was questioned at that time but police found no valid reason to hold him and he was released without charges.
Earlier this past week, investigators approached him again.
They asked him for a DNA sample, which he gave voluntarily thereby potentially sealing his own fate, sources said.
http://nypost.com/2017/02/04/suspect-arrested-in-connection-with-murder-of-jogger/
He had no prior record, so until he agreed to a cheek swab, his DNA profile had been unknown to law enforcement, sources told The Post.
So he went back into Howard Beach after he had killed Karina ? And that's when an off duty LEO thought he seemed suspicious ? But LE couldn't detain him then...wow, he must be very skilled at deception ...jmo