| # | | 1910 - 116 years ago | | 1 | March 1, 1910  | 20th Century: 1st Half | Events | | March 1, 1910 Date on Seattle Daily Chronicle archive notebook (March 1, 1910 through May 15, 1910) - while researching the newspaper's archives, Kolchak discovers a similar series of murders that took place 42 years earlier, in 1931.

| | 2 | May 15, 1910  | 20th Century: 1st Half | Events | | May 15, 1910 Date on Seattle Daily Chronicle archive notebook (March 1, 1910 through May 15, 1910) - while researching the newspaper's archives, Kolchak discovers a similar series of murders that took place 42 years earlier, in 1931.

| | 1931 - 95 years ago | | 3 | February 15, 1931  | 20th Century: 1st Half | Events | | February 15, 1931 Date on Seattle Daily Chronicle archive notebook (February 15, 1931 through April 14, 1931) - while researching the newspaper's archives, Kolchak discovers a similar series of murders that took place 42 years earlier, in 1931.

| | 4 | March 29, 1931  | 20th Century: 1st Half | Events | | March 29, 1931 Date of first of 6 strangulations in the 1931 series of murders that Kolchak discovers while researching the newspaper's archives, continuing a trend every 21 years.

| | 5 | April 14, 1931  | 20th Century: 1st Half | Events | | April 14, 1931 Date on Seattle Daily Chronicle archive notebook (February 15, 1931 through April 14, 1931) - while researching the newspaper's archives, Kolchak discovers a similar series of murders that took place 42 years earlier, in 1931.

| | 6 | April 16, 1931  | 20th Century: 1st Half | Events | | April 16, 1931 Date of the last of 6 strangulations in the 1931 series of murders that Kolchak discovers while researching the newspaper's archives, continuing a trend every 21 years.

| | 1952 - 74 years ago | | 7 | March 26, 1952  | 20th Century: 50s | Events | | March 26, 1952 The Night Strangler kills Myra Johns, the first of his victims in the 1952 series of murders 21 years earlier, which Kolchak discovers researching the Seattle Daily Chronicle archives.

| | 8 | March 27, 1952  | 20th Century: 50s | Events | | March 27, 1952 The Night Strangler victim Myra Johns' body is found, which Kolchak discovers researching the Seattle Daily Chronicle archives.

| | 9 | March 30, 1952  | 20th Century: 50s | Events | | March 30, 1952 The Night Strangler kills his second victim in the 1952 series of murders 21 years earlier, which Kolchak discovers researching the Seattle Daily Chronicle archives.

| | 10 | April 2, 1952  | 20th Century: 50s | Events | | April 2, 1952 The Night Strangler kills his third victim in the 1952 series of murders 21 years earlier, which Kolchak discovers researching the Seattle Daily Chronicle archives.

| | 11 | April 5, 1952  | 20th Century: 50s | Events | | April 5, 1952 The Night Strangler kills his third victim in the 1952 series of murders 21 years earlier, which Kolchak discovers researching the Seattle Daily Chronicle archives.

| | 12 | April 14, 1952  | 20th Century: 50s | Events | | April 14, 1952 In total, 6 women have now been found murdered in the Night Strangler's 1952 series of murders 21 years earlier, which Kolchak discovers researching the Seattle Daily Chronicle archives.

| | 1973 - 53 years ago | | 13 | April 1, 1973  | 20th Century: 70s | Events | | April 1, 1973 The Night Strangler kills Marissa on her way home from work - one of the three belly dancers at Omar's Tent, a well known bar in the Pioneer Square area.

| | 14 | April 4, 1973  | 20th Century: 70s | Events | | April 4, 1973 Kolchak introduces himself at the local police headquarters, and visits Omar's Tent, where the previous victim worked as a belly dancer.

| | 15 | April 6, 1973  | 20th Century: 70s | Events | | April 6, 1973 The Night Strangler kills a cocktail waitress named Gail a block and a half from the previous murder.

| | 16 | April 7, 1973  | 20th Century: 70s | Events | | April 7, 1973 Kolchak interviews Louise Harper, a belly dancer at Omar's Tent, where the Night Strangler's first victim also worked.

| | 17 | April 8, 1973  | 20th Century: 70s | Events | | April 8, 1973 Kolchak researches the Seattle Daily Chronicle archives, discovering a similar series of murders that took place 21 years earlier, in 1952.

| | 18 | April 9, 1973  | 20th Century: 70s | Events | | April 9, 1973 The Night Strangler kills Joyce Gabriel while she walks home from a date in the Pioneer Square area.

| | 19 | April 10, 1973  | 20th Century: 70s | Headlines | | April 10, 1973 Date of Seattle Daily Chronicle headline: Third Waterfront Slaying. Police are not happy about Kolchak's claim about the pattern of 6 similar strangulations occuring every 21 years.

| | 20 | April 11, 1973  | 20th Century: 70s | Events | | April 11, 1973 Kolchak invites belly dancer Louise Harper from Omar's Tent to join him on a tour of the Seattle underground, departing from the Blue Banjo bar.

| | 21 | April 15, 1973  | 20th Century: 70s | Events | | April 15, 1973 The first of four nights that Kolchak convinces belly dancer Louise Harper to act as bait in an attempt to attract the Night Strangler. No luck.

| | 22 | April 15, 1973  | 20th Century: 70s | Events | | April 15, 1973 The Night Strangler kills Omar's Tent belly dancer Charisma Beauty.

| | 23 | April 16, 1973  | 20th Century: 70s | Events | | April 16, 1973 The second of four nights that Kolchak convinces belly dancer Louise Harper to act as bait in an attempt to attract the Night Strangler. No luck.

| | 24 | April 17, 1973  | 20th Century: 70s | Events | | April 17, 1973 The third of four nights that Kolchak convinces belly dancer Louise Harper to act as bait in an attempt to attract the Night Strangler. No luck.

| | 25 | April 18, 1973  | 20th Century: 70s | Events | | April 18, 1973 The fourth of four nights that Kolchak convinces belly dancer Louise Harper to act as bait in an attempt to attract the Night Strangler, when things begin to happen - the Night Strangler spots her, but the police arriving to arrest Kolchak scares him off.

| | 26 | April 19, 1973  | 20th Century: 70s | Events | | April 19, 1973 After Tony Vincenzo bails him out of jail, Kolchak confronts the Night Strangler in the Seattle Underground, where he manages to destroy the serum that the killer needs to maintain his youth, effectively killing him.

| | 27 | April 20, 1973  | 20th Century: 70s | Headlines | | April 20, 1973 Date of Seattle Daily Chronicle headline: Killer Found, changed from Kolchak's original story: 144-Year-Old Killer Found.

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