A two-neutron unbound excited state of $^{24}$O was populated through a (d,d) reaction at 83.4 MeV/nucleon. A state at $E = 715 pm 110$ (stat) $pm 45 $ (sys) keV with a width of $Gamma < 2$ MeV was observed above the two-neutron separation energy placing it at 7.65 $pm$ 0.2 MeV with respect to the ground state. Three-body correlations for the decay of $^{24}$O $rightarrow$ $^{22}$O + $2n$ show clear evidence for a sequential decay through an intermediate state in $^{23}$O. Neither a di-neutron nor phase-space model for the three-body breakup were able to describe these correlations.
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