Murder accused Liam Reid has told the High Court in Christchurch that a pubic hair found in Emma Agnew's car may have blown in off the street.
The 36-year-old, who is charged with killing Ms Agnew and raping and attempting to murder a Dunedin student in November last year, is giving evidence in his own defence.
Earlier in the trial, the court was told that a hair from Mr Reid was found on the back seat of Ms Agnew's car, and his handprint was on the car door.
Mr Reid said he remembers looking at a car that was for sale, but says he never met Ms Agnew and denies killing her.
He said the hair may have blown in off the street or been planted after his arrest.
Mr Reid told the court the investigation against him had been botched.
He said cellphone records produced by the Crown did not link him to the Christchurch or Dunedin case.
Three more witnesses are being called to give evidence for the defence.