The NFL has launched an investigation into Tyreek Hill ... after his estranged wife, Keeta Vaccaro, alleged he was violent with her several times during their 17-month marriage.
Sources tell TMZ Sports ... the league initiated the probe this week as part of its "standard policy." No word yet on how it'll impact the star receiver's status for the Dolphins' tilt with the Patriots on Sunday ... or any other Miami games going forward.
According to court documents we obtained this month, Vaccaro alleged that on eight separate instances during their time as a married couple, Hill got physical with her.