Andy Slater is a sports talk radio host in Miami that breaks some stories from time to time. It's notable that Gase confirmed the situation.
NFL Network's Ian Rapoport also tweeted: "#Dolphins coach Adam Gase says Jarvis Landry is under investigation. I'm told it's a situation with the mother of his child & team has known...When the situation arose months ago, police came & looked into it. Did not prosecute. Jarvis Landry cooperated & provided info to #Dolphins".
Landry is going into a contract year. The two sides have been at an impasse on extension talks, and perhaps this is one of the reasons the Dolphins are hesitant. There has been no word for the league yet as to whether Landry faces any kind of discipline.