[¶ 1.] Stаcia Marie Johnson (Johnson) brought a claim for personal injuries arising out of an automobile accident against Ervin Floyd Armfield (Armfield). Arm-field admitted his own negligence but claimed that Jоhnson’s negligence had contributed to the accident. After a three-day trial, a jury denied all of Johnson’s personal injury claims, and Johnson now appeals. Because we believe there was insufficient evidence to justify submitting the issue of contributory negligence to the jury, we reverse and remand for a new trial.
FACTS AND PROCEDURE
[¶ 2.] On the morning of November 16, 1999, Johnson was driving her 1995 Chevrolet Cavalier north along Southeastern Drive in Sioux Falls, South Dakota. The weather was clear and there was little traffic. Johnson, a graduate of Augustana College currently working as a dental assistant, had the day off and was returning home from her parents’ house. Her route took her past the Avera McKennan Wellness Center, located on the eаst side of Southeastern Drive.
[¶ 3.] As Johnson passed the Wellness Clinic, a Jeep driven by Armfield, a retired military paratrooper and commercial printer, exited the Wellness Clinic drivеway, crossed two lanes of traffic, and struck the passenger side of Johnson’s vehicle. Arm-field testified that he had checked both left and right before pulling out onto Southeastеrn Drive. Seeing no oncoming cars, Armfield falsely believed he could safely pull out onto the street. The resulting collision knocked Johnson’s vehicle into a ditch on the west side оf the street. Johnson’s vehicle was totaled and the front end of Armfield’s Jeep was crushed. After the accident, Johnson sought medical treatment for several injuries including whiplash аnd a serious ankle injury.
[¶ 4.] Johnson subsequently brought a claim for personal injuries arising out of the accident. Recognizing that he had a duty to yield to oncoming traffic, Armfield admitted his own negligеnce. Armfield, however, argued that Johnson had been speeding at the time of the accident and asserted the affirmative defense of contributory negligence. Armfield also contested the extent and nature of the injuries claimed by Johnson.
[¶ 5.] The trial lasted for three days. During the settlement of jury instructions, Johnson argued that the issue of contributory negligencе should not go to the jury because no evidence had been offered to suggest she had been speeding at the time of the accident. The trial court overruled this objeсtion and proceeded to submit the contributory negligence instruction to the jury.
[¶ 6.] The jury returned a verdict in favor of Armfield and denied any recovery for Johnson. The trial court alsо denied Johnson’s motion for judgment notwithstanding the verdict and motion for a new trial. Johnson appeals and raises two issues for our review:
1. Whether the trial court abused its discretion whеn it submitted the issue of contributory negligence to the jury.
*481 2. Whether the trial court erred when it instructed the jury that a violation of the speed limit by Johnson constituted contributory negligence without reference to the element of proximate cause.
STANDARD OF REVIEW
[¶ 7.] Trial courts enjoy broad discretion in determining how to instruct a jury.
State v. Pellegrino,
[¶8.] As reiterated in
Thomas v. Sully County,
ANALYSIS AND DECISION
[¶ 9.] 1. Whether the trial court abused its discretion when it submitted the issue of cоntributory negligence to the jury.
[¶ 10.] Johnson contends that the trial court abused its discretion when it allowed the jury to consider the issue of contributory negligence. In
Boomsma v. Dakota, Minnesota, & Eastern Railroad Corp.,
Contributory negligence is a ‘breach of duty which the law imposes upon persons to protect themselves from injury, and which, concurring and cooperating with actionable negligence for which dеfendant is responsible, contributes to the injury complained of as a proximate cause.’
(quoting
Starnes v. Stofferahn,
[¶ 11.] As an affirmative defense, Armfield had the burden of proof in establishing contributory negligence.
See Bauman v. Auch,
[¶ 12.] Without further competent evidence, we believe these factors were insuf *482 ficient to support Armfield’s theory of contributory negligence. Armfield’s bare assertion that Johnson must have been speeding or he wouldn’t have pulled out onto the street in the first рlace lacks evidentiary support. Armfield did not produce any expert testimony tending to show Johnson was speeding at the time of the accident. Furthermore, while Arm-field was tiсketed at the scene of the accident, the officer at the scene determined Johnson had not been speeding and declined to issue her a citation. In addition, Jоhnson also consistently testified she was going five miles per hour under the speed limit at the time of the accident.
[¶ 18.] Even assuming
arguendo
that Johnson was speeding, her negligence must have been the рroximate cause of her injury in order to bar recovery.
Wilson v. Great Northern Railway Co.,
[¶ 14.] As we have consistently recognized, “an appellant must show not only that a particular instruction was erroneous, but also that it was prejudicial, meaning the jury probably would have returned a different verdict if the faulty instruction had not been given.”
Veeder,
[¶ 15.] Armfield failed to present sufficient evidence to support instructing the jury on his theory of contributory negligence. In addition, as contributory negligence was the heart of Armfield’s defense, the improper contributory negligence instruction clearly prejudiced Johnson. Thus, we believe the trial court abused its discretion when it instructed the jury on the issue of contributory negligence, and Johnson is entitled to a new trial.
[¶ 16.] 2. Whether the trial court erred when it instructed the jury that a violation of the speed limit by Johnson constituted contributory nеgligence without reference to proximate cause.
*483 [¶ 17.] Because we hold the issue of contributory negligence should not have been submitted to the jury, it is unnecessary to address issue two.
[¶ 18.] Reversed and remanded for a new trial.
