The defence of a Toronto teenager accused of manipulating her boyfriend into killing a teenage girl she had never even met has decided not to call any evidence.

As a result, the jury could start deliberating the fate of 17-year-old M.T. by either late Monday or sometime on Tuesday.

M.T. stands charged with first-degree murder in the stabbing death of Stefanie Rengel, stabbed to death on New Year's Day 2008.

Her alleged killer is D.B., boyfriend of M.T.

Neither can be named under provisions of the Youth Criminal Justice Act.

D.B. also faces a charge of first-degree murder and is scheduled to go to trial in October.

The Crown finished presenting evidence on Thursday.

The Crown has attempted to prove that M.T. was obsessively jealous of Rengel, who she had never met. However, Rengel had briefly been involved with D.B. M.T. is alleged to have told D.B. they would not have a sexual relationship unless he killed Rengel.

D.B. is alleged to have stabbed Rengel after luring her outside her East York home with a cellphone call on Jan. 1, 2008. A witness has testified she saw him loitering in the area the day before, continually using his cellphone.

A wtiness has testified he went to Rengel's home on Oct. 20, 2007 to tell her that M.T. wanted her dead.

The Crown has presented hundreds of pages of cellphone and text message records from the cellphones of M.T., D.B. and Rengel.

Twelve minutes after a passerby called 911 to say he had found a mortally-wounded Rengel, those records show that M.T. placed a three-second call to Rengel's phone that went straight to voicemail.

M.T. had told D.B. on Dec. 17 that "ur getting blocked" unless he killed Rengel.

In an exchange on Facebook, M.T. told a friend that she had made love with D.B. after Rengel's death.

However, M.T. had told police in an interview conducted about 12 hours after the murder that she had been joking about wanting Rengel dead.