The committee will investigate all aspects of the issue, including the social, legal, medical, cultural, financial, ethical and philosophical implications.
Mr O'Connor said the committee wanted to hear from all interested groups and individuals.
Mr Vickers earlier told the New Zealand Herald the inquiry was keeping the memory of his wife alive.
"Lecretia is a huge part of my life and not having her around any more is hard. But with this [inquiry] taking place, it's kind of like she's still here, in a way. It's keeping her memory alive ... it's heartening ..."
A private person, Ms Seales never sought to be the face of the right-to-die campaign in New Zealand and Mr Vickers told the Herald the decision to go public, an inevitable consequence of the legal bid, had been difficult.
The voluntary euthanasia inquiry will cover
•The factors that contribute to the desire to end one's life.
•The effectiveness of services and support available to those who desire to end their own lives.
•The attitudes of New Zealanders towards the ending of one's life, and the current legal situation.
•International experiences of the issue.