Question 4:
Based on the observations that the body was completely stiff (rigor mortis) and had a purplish-blue discoloration (lividity), this suggests that death occurred at least a few hours prior to discovery. Given that the body was at room temperature when found, we can estimate the time of death to be approximately 2 to 12 hours before 3:00 PM, making the possible time of death range from 3:00 AM to 1:00 PM on Tuesday.
Question 5:
It is unlikely that Dr. Fisher's body was moved after death, as he was found lying on his back with complete rigor mortis and lividity indicating he had been in that position for some time, suggesting a stable environment post-mortem for the development of those physical signs of death.
Question 6:
Since the blood toxicology screen was clean, it is unlikely that Dr. Fisher was under the influence of the illegal drug at the time of death, as the absence of such substances in his system would indicate he was not actively using at the time. This could suggest he may have been involved in drug-related activities or associations independent of its immediate use, which could lead investigators to consider whether he was a target due to such connections. This evidence may imply that the motive for his murder could be linked to drug interactions or conflicts rather than personal vendettas or other more straightforward reasons.