Da Silva said he took Ms O'Keefe home where they got into an argument, before he handed her a sleeping bag and sent her on her way.
A lawyer acting for the family, Caty Richard, said Da Silva had sensed Ms O'Keefe's vulnerability after she was unable to meet up with two friends.
Her three siblings are in France for the trial, but her Melbourne father and mother felt too ill to attend, the Age newspaper reported.
Mr O'Keefe said he would not be able to handle seeing the explicit photographs and exhibits likely to be presented as evidence.
"The worst stress of all is grief."
A verdict in the trial is expected this week. "I feel stressed and anxious and just hope all the truth comes out."
Mr O'Keefe said a guilty verdict and lengthy jail period would bring some closure, but would not bring his daughter back. "Without Jeanette it can never be over."
Ms O'Keefe's mother, Susan, told the Herald in 2001 her daughter had liked New Zealand because it was easy to find work and she enjoyed tramping and climbing. She had worked for Air New Zealand, Work & Income and Housing New Zealand.