Make use of the article to answer the questions.

(CNN) -- Jenni-Lynn Watson's shorthand while sending text messages came back to haunt the young man who pleaded guilty Tuesday in Syracuse, New York, to killing the college student, a prosecutor said.

Although the 20-year-old victim's cell phone was never found, investigators were able to review call and text messages made by Watson and Steven Pieper, the man she was breaking up with, Onondaga County District William Fitzpatrick told CNN.

After dumping Watson's body, Pieper, 21, tried to cover up by texting a mutual friend of theirs, pretending to be Watson, Fitzpatrick said.

Using the letters "GTG" apparently did him in.

Police looked at Pieper's phone, which was left November 19, 2010, at Watson's home in the Syracuse suburb of Liverpool, and pored over records, Fitzpatrick said.

That shorthand for "got to go" was a term used by Pieper, not Watson, the prosecutor said.

Pieper pleaded guilty in Onondaga County Court to second-degree murder in the strangling of Watson. Rather than 25 years to life, a plea agreement calls for him to receive a sentence of 23 years to life at the March 8 sentencing, Fitzpatrick said, adding Pieper must serve 23 years before he gets a parole hearing.

"Steven made it clear that he did not want to put the Watson family or his family through a trial in this matter, from the very beginning," defense attorney Scott Brenneck told CNN affiliate YNN. "So after a review of the case, it was an appropriate way to resolve it."

CNN left messages for Brenneck on Tuesday.

1. Who died?
2. How was she killed?
3. By whom?
4. How old is he?
5. And how old was his victim?
6. Had they dated previously?
7. Did police analyze Watson's phone?
8. Whose did they examine?
9. Where was it located?
10. What type of records were carefully examined?
11. Who used the term "got to go"?
12. How did Watson type that same phrase?
1. Jenni-Lynn Watson
2. she was strangled
3. Steven Pieper
4. 21
5. 20
6. yes
7. no
8. Pieper's
9. at Watson's home in the Syracuse suburb of Liverpool
10. phone
11. Pieper
12. She didn't..."got to go" was a term used by Pieper, not Watson