A search warrant affidavit obtained by The World-Herald detailed Washington's communications with the girl before he sent her the explicit video.
Washington and the girl had dated in eighth and ninth grades, but had begun speaking again in 2018 on Instagram after the girl, then 17, congratulated him about going to Nebraska to play football.
The conversations turned sexual, the affidavit said, and Washington made sexual advances toward the girl. When she told him she wasn't interested in a romantic relationship with him, he became "increasingly aggressive in his communication," the affidavit said, and became "angry and mean."
The girl blocked him on Instagram.
On March 2, about 8:43 a.m., the girl received a text message from Washington from a number that was later found to be registered to Washington's adoptive father, the document says.
The text contained a 10-second video of a girl performing oral sex on one teen in the back seat of a vehicle, with another teen masturbating while watching her naked behind.
"Remember this hoe," the text from Washington said, according to the affidavit.