To keep a running list of all the "In Death" books I have read I am dedicating this page with an intention of updating the list as I read the series.
1. Naked In Death - Read in January 2010
2. Glory In Death - Read in January 2010
3. Immortal In Death - Read in January 2010
4. Rapture In Death - Read in January 2010
5. Ceremony In Death - Read in February 2010
6. Vengeance In Death - Read in February 2010
7. Holiday In Death - Read in March 2010
8. "Midnight in Death" (in the Silent Night anthology or the Three in Death anthology) - Read in July 2010
9. Conspiracy In Death - Read in April 2010
10. Loyalty in Death - Read in April 2010
11. Witness In Death - Read in June 2010
12. Judgment in Death - Read in July 2010
13. Betrayal in Death - Read in July 2010
14. "Interlude in Death" (in the Out of this World anthology or the Three in Death anthology) - Read in August 2010
15. Seduction in Death - April 2011 (in Audiobook
16. Reunion in Death - April 2011 (in Audiobook)
17. Purity in Death - April 2011 (in Audiobook)
18. Portrait in Death - April 2011 (in Audiobook)
19. Imitation in Death - May 2011 (in Audiobook)
20. Remember When - May 2011 (in Audiobook)
21. Divided in Death - May 2011 (in Audiobook)
22. Visions in Death - May 2011 (in Audiobook)
23. Survivor in Death - May 2011 (in Audiobook)
24. Origin in Death - May 2011 (in Audiobook)
25. Memory In Death - May 2011 (in Audiobook)
26. "Haunted in Death" (in the Bump in the Night anthology or the Three in Death anthology) - May 2011 (in Audiobook)
27. Born In Death - May 2011 (in Audiobook)
28. Innocent in Death - June 2011 (in Audiobook)
29. "Eternity in Death" (in the Dead of Night anthology) - June 2011 (in Audiobook)
30. Creation in Death - June 2011 (in Audiobook)
31. Strangers In Death - June 2011 (in Audiobook)
32. Salvation In Death - June 2011 (in Audiobook)
33. "Ritual in Death" (in the Suite 606 anthology) - June 2011 (in Audiobook)
34. Promises in Death - July 2011 (in Audiobook)
35. Kindred in Death - July 2011 (in Audiobook)
36. "Missing in Death" (in The Lost anthology) - July 2011 (in Audiobook)
37. Fantasy in Death - July 2011 (in Audiobook)
38. Indulgence in Death - July 2011 (in Audiobook)
39. "Possession in Death" (in The Other Side anthology) - August 2011 (in Audiobook)
40. Treachery in Death - August 2011 (in Audiobook)
3. Immortal In Death - Read in January 2010
4. Rapture In Death - Read in January 2010
5. Ceremony In Death - Read in February 2010
6. Vengeance In Death - Read in February 2010
7. Holiday In Death - Read in March 2010
8. "Midnight in Death" (in the Silent Night anthology or the Three in Death anthology) - Read in July 2010
9. Conspiracy In Death - Read in April 2010
10. Loyalty in Death - Read in April 2010
11. Witness In Death - Read in June 2010
12. Judgment in Death - Read in July 2010
13. Betrayal in Death - Read in July 2010
14. "Interlude in Death" (in the Out of this World anthology or the Three in Death anthology) - Read in August 2010
15. Seduction in Death - April 2011 (in Audiobook
16. Reunion in Death - April 2011 (in Audiobook)
17. Purity in Death - April 2011 (in Audiobook)
18. Portrait in Death - April 2011 (in Audiobook)
19. Imitation in Death - May 2011 (in Audiobook)
20. Remember When - May 2011 (in Audiobook)
21. Divided in Death - May 2011 (in Audiobook)
22. Visions in Death - May 2011 (in Audiobook)
23. Survivor in Death - May 2011 (in Audiobook)
24. Origin in Death - May 2011 (in Audiobook)
25. Memory In Death - May 2011 (in Audiobook)
26. "Haunted in Death" (in the Bump in the Night anthology or the Three in Death anthology) - May 2011 (in Audiobook)
27. Born In Death - May 2011 (in Audiobook)
28. Innocent in Death - June 2011 (in Audiobook)
29. "Eternity in Death" (in the Dead of Night anthology) - June 2011 (in Audiobook)
30. Creation in Death - June 2011 (in Audiobook)
31. Strangers In Death - June 2011 (in Audiobook)
32. Salvation In Death - June 2011 (in Audiobook)
33. "Ritual in Death" (in the Suite 606 anthology) - June 2011 (in Audiobook)
34. Promises in Death - July 2011 (in Audiobook)
35. Kindred in Death - July 2011 (in Audiobook)
36. "Missing in Death" (in The Lost anthology) - July 2011 (in Audiobook)
37. Fantasy in Death - July 2011 (in Audiobook)
38. Indulgence in Death - July 2011 (in Audiobook)
39. "Possession in Death" (in The Other Side anthology) - August 2011 (in Audiobook)
40. Treachery in Death - August 2011 (in Audiobook)