State v. Tamalini
In State v. Tamalini, 134 Wn.2d 725, 953 P.2d 450 (1998), the defendant requested first and second degree manslaughter as both a lesser included offense and/or an inferior degree offense.
The lesser included offenses were rejected because the specific mental elements differed between the lesser included offenses requested and the crime charged.
The inferior degree offenses were rejected because "the manslaughter statutes and the felony murder statutes proscribe significantly different conduct and thus define separate and distinct crimes." 134 Wn.2d at 732.