that the alleged errors committed by the trial court are not harmless and, taken together, deprived him of a fair trial. His argument based on the doctrine of cumulative error is without merit. 11. Sentence of Life Imprisonment Without Parole The trial court sentenced Robinson to life imprisonment without parole for his conviction of first degree murder, which was classified as a Class IA felony. At the time Daniel Lockett was murdered, the penalty for a Class IA felony was life imprisonment. See Neb. Rev. Stat. § 28-105(1) (Cum. Supp. 2000). Thus, the trial court had statutory authority to impose a sentence of life imprisonment for the first degree murder conviction, but it lacked authority to add the phrase “without parole.” See State v. Conover, 270 Neb. 446, 703 N.W.2d 898 (2005) (<HOLDING>). See, also, State v. Rouse, 206 Neb. 371, 293
holding unconstitutional defendants sentence of death based upon the holding in roper supra and remanding for the montgomery circuit court to set aside the defendants death sentence and to sentence him to the only other sentence available  life in the penitentiary without the possibility of parole holding life in prison without the possibility of parole was not cruel and unusual punishment for juvenile convicted of murder holding unconstitutional a sentence of life imprisonment for passing a bad check by a convicted felon holding that sentence was erroneous but not void where sentence of life imprisonment without parole was imposed for first degree murder under unconstitutional penalty statute holding that graham which prohibited the imposition of a life without parole sentence on a juvenile offender who did not commit homicide does not apply to a lengthy termofyears sentence that might constitute a de facto life sentence