Norlina Police Chief Taylor Bartholomew said investigators believed Valentine may be headed to the Richmond-area to confront other family members.
The maximum prison sentence would be sought for Medina, who faces 25 years to life in prison at a sentencing hearing scheduled for January, prosecutors said.
Jurors on Wednesday rejected the argument that Derek Medina, 33, acted in self-defence when he shot 27-year-old Jennifer Alfonso eight times in August 2013 at their Miami residence, according to a court spokeswoman.
"No family should ever have to see their daughter killed and then exhibited worldwide on the internet like some macabre trophy to a husband's anger as was Jennifer Alfonso," State Attorney Katherine Fernandez Rundle said in a statement.
Later in the day, police carried out several hours of raids in the Paris suburb of Mantes-la-Jolie, where Abballa lived.
A young pregnant woman wearing a hijab and an Islamic robe said her husband had been taken into custody from the building in the Musiciens neighborhood as police searched her home.