I looked it up and it sounds like he kept on sending them tweets after they blocked him. Supposedly it happened over a long time and he sent some nasty stuff including but not limited to:

“Hateful b--tch!”
“Heather’s fat a** gets fatter”

and then:
“A whole lot of ugly at the Cadillac Lounge tonight,” @greg_a_elliott tweeted. The tweet made her fear that Elliott was at the same bar and search the room to make sure he was not, she said.

http://www.thestar.com/news/crime/2014/07/24/twitter_harassment_trial_second_complainant_says_accused_wouldnt_leave_her_alone.html