A Manhattan jury on Tuesday found a city police officer guilty of conspiring to capture, kill and eat several women, including his wife.
Gilberto Valle, 28, now faces life in prison, but his lawyers want to appeal the verdict.
He was arrested by FBI investigators last year following a tip by his now-estranged wife.
Jurors also found him guilty of illegally using a national crime database to get information on his potential victims.
During the trial, prosecutors insisted that Valle was ready to act and showed grotesque documents, chats and emails that laid out his plans.
One document was called "Abducting And Cooking Kimberly, A Blueprint."
Defense lawyers argued the documents only showed fantasy role play on the Internet.
"Obviously the case involved thoughts that were unusual and bizarre, and frankly very ugly, and we think that the jury just couldn't get past that," said Julia Gatto, Valle's attorney.
Prosecutors said Valle met with targets and even gave them police union cards to gain their trust, while at the same time chatting online about cooking them.
While Valle did not actually kidnap or kill anyone, prosecutors said the FBI was not going to wait for him to carry out his plan.
U.S. Attorney Preet Bharara said Valle's intentions were "very real," adding, "The Internet is a forum for the free exchange of ideas, but it does not confer immunity for plotting crimes and taking steps to carry them out."
But Valle's lawyers said they were concerned about the message his conviction sends.
"There was a larger principle involved in this case. And I think it sets a very dangerous precedent," said defense attorney Robert Baum. "That people can be prosecuted for their thoughts and convicted, which is even sadder to think about. "
When NY1 asked Elizabeth Valle, Gilberto's mother, what she would tell her son, she answered, "Hang in there, just hang in there."
Asked how she was doing, Elizabeth Valle answered, "Look at me, I'm strong."
Police Commissioner Ray Kelly said Tuesday that Valle will be immediately terminated from the department.