OD<br>My wife's nephew had drug addiction problems for years. He was on methadone, trying to recover from heroin addiction. He celebrated the capture of the Tsarnaev terrorist by shooting up. Unfortunately, he overdosed and died. He was cremated a few days later.
Methadone is like heroin.
The context does not state what the similarities and differences are between methadone and heroin. They could potentially be similar since methadone is used in place of heroin, but I don't even know. 
( z1 resemble :ARG1 ( z2 methadone ) :ARG2 ( z3 heroin ) )