Murder Maths

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Across
  1. 2. Fluid which was gathered from a cup found at the crime scene
  2. 3. Top half of a fraction
  3. 9. Bottom half of a fraction
  4. 11. We worked out the angle of impact using droplets of this fluid
  5. 13. Makes fireworks sparkle
  6. 14. The middle number
  7. 17. First name of a 40 year old actress
  8. 18. We used the ridges of these to find the gender of the culprit
Down
  1. 1. Technique used to separate mixtures into their individual components
  2. 2. The size of this wearable item roughly correlates with height
  3. 4. Colourful ornament that aided our investigation
  4. 5. First name of a 65 year old retired supermarket manager
  5. 6. A toxic by-product of fireworks
  6. 7. First name of a 56 year old farmer
  7. 8. First name of the person who left the party at 12:43 am
  8. 10. First name of the person who left the party at 12:30am
  9. 12. First name of a 30 year old tennis player
  10. 15. First name of the person seen talking to Rick O'Shea
  11. 16. The most frequently occurring number