>> the mainstay of killing through physician assisted suicide is a drug called pentobarbital. it works by suffocating victims. >> all the arguments they bring up. it's a simply slope. it's depressed. this is an act of desperation, a cry for help. there'll be coerce, abuses. the same arguments brought up 20 years ago. here we are, 20 years later, and after it being in practice in argon for 17 years, there's not concerns. >> dan was married to britney minard. the california woman suffering from terminal brain cancer, who openly lived out her final days advocating for the right to die. >> i still have enough joy and i laugh and smile with my family and friends. it doesn't seem like the right time. it will come, i feel myself getting sicker. it is happening each week. >> the couple moved to oregon, where doctors can legally prescribe lethal medication. >> my husband is a lovely man. i understand everyone needs to grieve. but i want him to be happy. >> britney ended her life in november 2014. >> people need to thing through this themselves. what is worth, a peaceful passing or bein