As with U.S. polls, responses vary greatly with the wording of the question. The most straightforward question asks the actual legislative issue: "As you may know, Canada eliminated the death penalty for murder in July 1976. All things considered, would you support or oppose reinstating the death penalty for murder in Canada?" The ayes swamp the nays, a bit under 2-to-1: 61% yes, 34% no, 5% not sure.
On a somewhat more general question, 8% say the death penalty is "always appropriate," 63% say sometimes, 23% say never, and 5% are not sure. The question does not specify that it is asking about punishment for murder, but presumably nearly all respondents would understand that. Comparing this question with the previous one, it appears that about 11% of people who think the death penalty is sometimes appropriate nonetheless oppose reinstatement, probably persuaded by practical arguments of cost or the possibility of executing an innocent person.
On the badly worded question that implies a single punishment choice for all murders, half of Canadians choose life in prison, as do about half of the people of the United States. "All things considered, which of these two approaches would you prefer as a punishment for convicted murderers in Canada?" LWOP: 50%; death 38%; not sure 12%. (See my prior criticisms of this question here and here.)