The jury in the case of the murder-accused Dean Cameron began deliberating on Thursday morning at the High Court in Christchurch.
The 39-year-old is charged with raping and murdering teenager Marie Davis, whose body was discovered in the Waimakariri River in April last year.
The Crown says its "solid" evidence proves Dean Cameron is guilty.
His semen was found on the 15-year-old's body, his blood was on the floor of her home and telecommunications records show his cellphone was near both her house and the river at relevant times.
But the defence argues an alcohol-affected Marie Davis may have consented to sex with Mr Cameron and that there is no evidence his blood was left on the floor of her house the night of the attack.
The defence also told the jury to put little weight on cellphone records, which it says are incomplete.