clear of his motorcycle and later died from his injuries.
The plaintiffs filed a § 1983 suit against Deters, Benton, and the City of DeRidder, claiming that the high-speed pursuit of the decedent and the establishment of the roadblock amounted to gross negligence and excessive use of force. The plaintiffs also filed a survival and wrongful death action under Louisiana law.2 See La.Civ.Code Ann. arts. 2315, 2315.1, 2315.2. Deters filed a motion for summary judgment on all of the plaintiffs’ claims against him, which the district court granted.3 The action against Benton and the City of DeRidder proceeded to trial.4
At trial, the plaintiffs called Ken Katsaris, an expert on police procedures and training, to give his opinion regarding whether Benton backed his car into the decedent. The district court refused to admit this opinion testimony, based on its conclusion that Katsaris was not qualified as an accident reconstruc-tionist. See Fed.R.Evid. 702 (concerning qualifications of expert witnesses).
The jury deliberated for approximately one and one-half hours before announcing to the district court that it was deadlocked. The jury was then given a special interrogatory form, which instructed the jury to answer interrogatory no. 1 first. That interrogatory asked: “Do you find by a preponderance of the evidence that at the time of impact, Robert L. Benton was backing up his [pjolice car into the path of Alberto Rosado’s motorcycle?” In the event of a “No” answer, the jury was to “go to the end of the form, sign it, and return it to the Marshall [sic].”
The jury answered interrogatory no. 1 in the negative. Instead of proceeding to the end of the form, however, the jury also answered interrogatory no. 14, which asked: “Do you find, by a preponderance of the evidence, that Albert Rosado was also negligent and that his negligence was a legal cause of his death?” This interrogatory was also answered in the negative. Finding no irreconcilable conflict in the jury’s answers, the district court entered judgment for Benton and the City ofsDeRidder.
The plaintiffs raise the following issues on appeal: (a) that the court erred in granting summary judgment for Deters, the state trooper who pursued the decedent; (b) that the court abused its discretion by refusing to allow Katsaris to give his opinion on whether Benton backed his car into the decedent; and (c) that the jury’s answers to the special interrogatories were irreconcilable.
II
A
The plaintiffs first contend that the district court erred in granting summary judgment for Deters, on both their federal and state law causes of action. We review the district court’s grant of a summary judgment motion de novo. Davis v. Illinois Cent. R.R., 921 F.2d 616, 617-18 (5th Cir.1991). Summary judgment is appropriate if the record discloses “that there is no genuine issue of material fact and that the moving party is entitled to a judgment as a matter of law.” Fed.R.Civ.P. 56(c). A party seeking summary judgment bears the initial burden of identifying those portions of the pleadings and discovery on file, together with any affidavits, which it believes demonstrate the absence of a genuine issue of material fact.
2
When the complaint was filed, the plaintiffs lived in Puerto. Rico. Louisiana substantive law governs this diversity claim, as Louisiana is the forum state. See Ideal Mut. Ins. Co. v. Last Days Evangelical Ass'n, Inc., 783 F.2d 1234, 1238 (5th Cir.1986) (applying substantive law of forum state to diversity claim).
3
The magistrate judge, whose report and recommendations the district court adopted, stated that “[pjlaintiffs have not shown any basis of liability on the part of Officer Deters for the alleged improper use of the roadblock. It is the opinion of the undersigned that Officer Deters was within the scope of his duty as a state trooper in pursuing the decedent who was engaged in improper and reckless use of a motorcycle at a high rate of speed.” Record on Appeal vol. 3, at 336.
4
.In opposing motions for summary judgment filed on behalf of Benton and the City of DeRid-der, the plaintiffs offered a photograph of the accident scene depicting two parallel "skid” marks on the road leading directly to the wheels of Benton’s car. The district court concluded that this photograph created a genuine issue of material fact regarding whether Benton backed his car into the decedent.