A sample of about 5000 ${K}^{\ensuremath{-}}$ decays in flight, each accompanied by a Dalitz pair, has been observed in a hydrogen bubble chamber. These events consist of 3564 \ifmmode\pm\else\textpm\fi{} (3.1%) ${K}_{\ensuremath{\pi}2}$ events, 786 \ifmmode\pm\else\textpm\fi{} (4.6%) ${K}_{e3}$ events, 554 \ifmmode\pm\else\textpm\fi{} (7.6%) ${K}_{\ensuremath{\mu}3}$ events, and 574 \ifmmode\pm\else\textpm\fi{} (5.9%) ${\ensuremath{\tau}}^{\ensuremath{'}}$ events. Ratios among these numbers give results in agreement with accepted ${K}^{+}$ branching ratios. The separation of the events has involved a sophisticated Monte Carlo program, ionization, kinematics of the ${K}^{\ensuremath{-}}$ decay, and kinematics of the Dalitz decay. The ${\ensuremath{\pi}}^{\ensuremath{-}}$ energy spectrum of the ${\ensuremath{\tau}}^{\ensuremath{'}}$ decays may be written as: $(\mathrm{phase}\mathrm{space})\ifmmode\times\else\texttimes\fi{}[1+(\frac{2A}{{{M}_{\ensuremath{\pi}}}^{2}})({s}_{3}\ensuremath{-}{s}_{0})]$, where ${s}_{i}$ is the square of the 4-momentum transfer to particle $i$, ${s}_{0}=\frac{1}{3}({s}_{1}+{s}_{2}+{s}_{3})$, and $A$ is a slope to be determined. We find $A=0.242\ifmmode\pm\else\textpm\fi{}0.042$.